40 Times People Had No Clue What They Found, But The Internet Solved The Mystery (New Pics)

It’s a seal/stamp set. If the bottom of each small pieces are smooth, they are for you to custom to carve your name (pen name). A lot of workshops in China can do it easily. Maybe your local China town will be able to do it as well. Cool stuff.
Probably too much additional info, the words on the top of the box is 东壁图书，it should mean “the two stars 东and 壁, rule over all the books and graphs in the world”, it comes from some old Chinese poetry: 东壁图书府，西园翰墨林。 诵诗闻国政，讲易见天心。 位窃和羹重，恩叨醉酒深。 缓歌春兴曲，情竭为知音。
Roughly translated in: In the east, a library grand, In the west, a forest of brush in hand. Through poetry, the nation’s course we hear, Through the Book of Changes, heaven’s will appears.
A high station, honored, yet lightly borne, With gratitude for favors deep as morn. Soft songs evoke the joy of spring, True friendship inspires the heart to sing.

Storing baking trays right next to the oven.

It's to keep the door from closing. You put a loop on each side of the door handle and the cushion keeps the door from latching so you can bring in luggage, etc.

A classic old school towel drying rack.

Shotgun shells. It’s a hunting jacket.

Ear saver for n95 mask. Hook the elastic over the buttons instead of your ears.

Your post indicates you may possibly be in possession of unexploded ordnance (UXO).

Looks like antique perfume ampules. Also called perfume nips.

Ship captain here. On the gooseneck vents that ships and boats have on deck, there's a wire mesh screen right at the bottom of the opening and inside is a spherical aluminum ball. If water comes up on deck the ball will float up and plug the tube that comes from the ballast tank, water tank, fuel tank, void space or whatever it is. I've got three spares in my deck locker that look just like that.

It's a crystal radio. The galena crystal is on top (whisker) and the coil on the bottom.

It’s called 18 pound round shot and was used on US, French, and British ships, so it came from a ship near there. It’s solid iron.
It’s round shot that can only be used in smooth bore cannons, so it could be Civil War or could be revolutionary war. Look into if there were any battles near there and you can find more provenance.

It’s a spillway for the river. If the river floods it should flow out there before breaking the bank elsewhere. The steps are to slow down the water so it causes less erosion.

Sheetrock nails that are working out. Wall has flexed causing the nail heads to pop out.

It is part of a cover for a 19th/20th century Qing Dynasty Chinese gourd cricket cage. Probably ivory, possibly bone. There would have been a carved lattice base as well as a wood collar, all fitted to a gourd container.
Here is a nice complete one.
https://www.zacke.at/auction/lot/9-an-ivory-and-gourd-sanyang-cricket-cage-qing-dynasty/?lot=38580&sd=1
Here is one missing the part you have. https://www.invaluable.com/auction-lot/chinese-carved-gourd-cricket-cage-61-c-c4b4b99a4f

Early 1980s model Black and Decker SpotLiter brand rechargeable flashlight.

Could it be a dairy room?
A dairy room was a space on a farm where cheese and butter were prepared. It was often part of the farm kitchen for sanitary reasons and ease of access. Over time, the milk room became a separate farm structure or part of the barn.
http://researchingfoodhistory.blogspot.com/2018/04/dutch-dairies.html?m=1

Pretty sure they're suncatchers. The suction cup hook is to hang them on a window pane

I cannot tell the model from the back of that fuzzy pic but it is a gas leak detection unit.

It's called bulls eye glass. An homage to the way glass sheet used to be made

This is one of the Orion “boilerplates” that’s used for training and testing. This one appears to be a low-fidelity mockup that would be used for testing splash-down forces and then to train capsule recovery procedures.

Sure looks like a listening device to me. This is common to wire into a direct power source. Fun fact: watch batteries were invented to prolong surveillance devices and allow smaller listening devices. It also cut down on risk of sending someone in to constantly change out bugs. My favorite Place for fixed bugs is in the base of a lamp =P You should look into what we have nowadays. Credit cards with listening devices built in are pretty standard for informants(It's replaced having to carry a physical device to record/transmit which can be dangerous for informants.) Criminals nowadays will even demand to see your unlocked smart phone. Directional mics that can pick up vibrations on walls and windows and convert into sound are pretty cool. Cameras that send photons and receive the bounce patterns kinda like an infrared sensor to map out entire houses. Products ordered online and sent through Amazon, USPS, FedEx, UPS... can be intercepted and the device can be planted, item is repackaged with no signs of it being tampered with, then sent to individuals being surveyed.

Please do not use this book stand as a dish rack!!!
It is carved from a single piece of wood and made in uzbekistan. The word for them is either lauh or laukh, if you'd like to google it. 
BTW, if you find plans or a video of one being carved, tag me. I'd love to see it done. 

That is beyond doubt a broken brass headed percussion mallet for bells/glockenspiel. The waxy part is the fiberglass handle of what's called a 'two-step' mallet, where the handle is fiberglass with a rubber coating on the end.
Source: percussionist and band director.

FB Minden might stand for "Feuerbestattung" Minden - Minden crematory. I think you stumbled over a chamotte marker from a crematory that was used to track the identity of a body as it turned to ashes and was buried at sea.

That’s a glass RFID tag that’s been broken out of its glass capsule. I used to work for a company that sold these. It was either dropped by someone who was trying to insert it in an animal for tracking, or it was in an animal that was eaten.

Soviet perfume “Жасмин 76”.

It reminds me of the drainage thingies (I’ve blanked on the word) that you see in man made bodies of water that allows them to drain.
The various holes allow water to drain out at a variable rate depending on the height of the water.
I wonder if there is a history of severe flooding in this location that may need a way to drain faster than nature would allow.
Edit looks like that’s it. See link below. First image in the “photos” section
https://damfailures.org/lessons-learned/all-dams-need-an-operable-reservoir-drain-system/
Maybe this was once a reservoir that is now dry and the water supply you describe is the replacement?
Edit again; looks like this type is called a spillway riser and is for smaller bodies rather than the huge reservoirs you sometimes see.
Edit one final time: fam outlet towers seems to get results too.
Also, why did I do that to myself? I have a fear of powerful running water (waterfalls, spillways etc) and yet i image searched a number of terms to get accurate info. Now I feel very unwell indeed.
Edit again because why not: found the proper nem, it’s a draw off tower. Yes, I am still googling, yes I am still freaking myself out.

That's the microphone that picks up the shooter saying "pull" to release the clay pidgeon. It makes it more consistent for the shooters to have the automatic system release the clay than it is for a human to listen and respond hitting the button to send it flying. Just makes the sport more fair, and eliminates the possibility for that human error that definitely exists when not using this system. Source: Was top of my trap shooting team and practiced with both.

It's a plaque for the head tube of a bicycle frame from the Ajax cycle brand. That's why it's slightly convex.
The cycles with this logo were made in the town of Albert in the Somme region between 1906-1913, just before WW I broke out; 2 years later both factory and town were practically levelled by German artillery fire, and nearly a million men were k*lled at the Battle of the Somme there a year after

A 6" Civil War era cannon ball.

It is rodent poison.

It’s a hands free door opener.

Air purifier. UV light to k*ll germs like Covid that could travel through the air system

I think they're iWalkers/AdWalkers from this company (https://gomodigital.co.uk/iwalker), which does operate in Wales. 
Even the black clothing seems to be part of their standard look. 

Natural gas sniffers.

Apparatus for storing caught fish. Designed to stay put in a flowing stream.
-edit doesn't look like a trout creel but the form indicates a similar function.

It could be lime, where I go in Sweden the lakes and rivers are very acidic, and the local gov dumps lime in the lakes to raise the pH level.
https://www.laponiapictures.com/Nature/Lime+treatment+tower/@toj-03395
https://www.latimes.com/archives/la-xpm-1987-12-06-mn-26871-story.html

I believe this is a river height gauge. If you’re in the States, you may be able to find its readings via the USGS.

This is it. Dead ringer. They are carriers for biofilm-based bioreactor, aka weird shaped bits for gunk to grow on.
https://www.anoxkaldnes.com/sites/g/files/dvc4056/files/document/2020/09/AnoxKaldnes_Z-MBBR_Folder.pdf

It looks like a wish capsule. I have a few of these.

Hey OP, radiation safety officer here, this REALLY looks like a lead PIG used to shield a radiation source housed inside the black rod part. PIGs usually come with higher activity sources although they are occasionally with check sources. I highly recommend going down to your city’s fire department and seeing if they can scan this for you (smaller departments may not be able to do this but larger departments absolutely would have a hazmat unit that would have equipment that could) just to confirm the presence of radiation or not. If it is radioactive it might not be legal for you to own depending on the radioisotope, activity, and laws/regulations in Germany/EU.

I think you put essential oils on them and they scent drawers, cupboards, etc.

Looks like some tweaker took apart a shotgun shell. That's gunpowder and shot in there.

It is a bullet. You can see the rifling marks along the sides.
Full metal jacket - lead core with a copper alloy jacket.

Also from Cayman, and lived in that exact building for a year. Was always curious about those, but I know that it's not the telecommunications. Firstly the only submarine cable to the island (the Cayman-Jamaica Fiber System) lands at half-moon bay which is not even close, and on top of that the Marriott right beside this building also has 2, and I know other buildings down the beach have others.
This is deep water source cooling, and many buildings near the beach use it for cooling, as well as the new buildings in Camana Bay. I know that building has it, and I also learned about its importance for the island in school.

Ah ha! I think you've nailed it!
https://www.londonfine.co.uk/products/antique-gentlemans-gout-stool-english-leather-occasional-foot-rest-georgian
It's tilted on its side, as a padded footrest. "Finished with an inset butler's grasp, for moving across a room".
Gout stools were considered a status symbol due to gout's association with wealth and overindulgence in rich foods and alcohol. They were part of a broader cultural understanding of gout as "the disease of kings" or "rich man's disease". In addition to providing physical relief, gout stools feature prominently in period art and literature, often used to symbolize excess and the consequences of an overly luxurious lifestyle.
https://drawing-blood.org/pre-modern-medicine/gout-the-disease-of-kings/

Hand warmer. That is a stick of coal in the middle and then put it in the bed of asbestos.

It's to tell if the nuts have turned (loosened). In a pre-trip inspection the operator identifies if any of the pointers are not pointing at their partner. These particular indicators have two in one and were moulded with a zigzag portion to allow The second one to be tightened after the first one is tightened.

It's a temperature sensor for the air conditioning.

This is a Zack Dowdy special!
Guerrilla Skatespots. If you can make a concrete form, you can quickly and easily manufacture the majority of a concrete transition. Then you can spend a much shorter amount of time just grouting the lips.
The hardest part is getting all the pieces into and out of a Chevy Astro van and set in place!
The irony of building DIY skate spots is that you can have a simple spot for years. A slab or ledges or something, but the second you start "improving" the spot, the city bulldozes it and puts in a parking garage!

Possibly a weight to keep the machine from tipping forward when the door is opened.

It looks like someone was melting scrap lead or tin in a large spoon, likely cast iron, and letting it cool in the spoon. May have been making bullets or fishing sinkers. My father did this, but he poured the lead into a hockey puck shape.

Plant trellis/lattice for vines or other creeping plants to grow up on.

It is an ultrasonic animal repeller. Amazon link.

I have (or had, haven't seen it in years) one of these. It is a microwave oven leakage tester. You hold it around the edges of the door of the microwave, and the little neon bulb inside glows orange if it gets any microwave radiation. You can test it by putting it in the oven and turning the oven on; it should glow. I wouldn't do that for too long. I am not sure how much radiation can actually leak, but these were popular 30+ years ago when microwave ovens were less common.
I probably got mine in a Christmas stocking around 1990 or so

Its a violet ray device, quackary

Lightsaber chopsticks with the "blade" missing. Probably stuck on from water damage from being outside

Concrete injection, usually polyurethane. Used for structural repair.