The house I’m in how had a wedding dress and an old disassembled toddler bed in the attic crawlspace. I’d assume from the fairly young married couple I bought the house from who also had two young, but school-aged, children. Not super mysterious but I did find it strange that the dress was abandoned and I can’t believe they didn’t store/remove anything else from up there when packing up. I didn’t have a forwarding address and was never contacted about it. Years later, when I was getting married, my wife took it and cut it up to make decorations for the flower girl and her basket. Beats the trash, I suppose.
Many more observant Jewish people will use aluminum foil to wrap their kitchens during Passover.
https://www.chabad.org/holidays/passover/pesach_cdo/aid/374918/jewish/Aluminum-Foil.htm
Could be what it was used for by previous inhabitants.
Interesting theory, but the last few owners all appear to have been Christians or unbelievers, if names are any guide.
When I was a kid in West Texas, the local discount store was selling machetes cheap. I’d seen them in jungle movies and thought they were cool as hell, so I bought one. But then I didn’t know what to do with it, jungles not being plentiful in West Texas. Might still be stashed somewhere in the house I grew up in.
Not a bad day’s work:
It was! We visited friends in Atlanta, who’d said they were going to take us… well, someplace… and first we were blown away by going down under Atlanta, to a city under a city (covered up post-Civil War, but the stores down below became speakeasys during Prohibition).
But then, to find out we were going to eat and drink on board part of a three-masted schooner docked twenty feet underneath Atlanta… sigh …
It was “Dante’s Down the Hatch", and for anyone who was enamored of pirate ships as a kid, it was SO cool.
The Underground, but not much of a shot of the ship:
Here’s a shot of the stern…
Alas, the weirdest thing I ever found was a bar of Lifebuoy soap in the original red and yellow box. So I’ll have to share some other finds…
Try a web search for “movie posters found in walls”.
And, one day, someone is going to have a real surprise:
Cool!
I remember being amused by the “dans le” fanciness on the bottle label 
A couple years after moving into our house (which we lived in for about 20 years before selling a few months ago), I was cleaning off some shelves in a pantry in our basement and found a small glass bottle that was hidden (not purposefully, I don’t think) behind some trim work of the shelves. It was a bottle for some OTC medicine (I can’t remember what it was, but the label was for something old-timey like bromo-seltzer). The bottle and label looked to be at least a hundred years old, and whatever liquid (it was most definitely liquid, not a powder or pills) then in the bottle was very heavy – the bottle was about the size of a 50-count plastic bottle of aspirin, but it probably weighed close to a pound. I think it was a repurposed container that now held mercury (which weighs a little less than a pound per ounce), but I was never brave enough to open it. I left it out on a bookshelf for a number of years, and it’s someone else’s problem now: it sold during an estate sale while we were away.