Scrolling through this link reminds me of several things I have saved over the years.
In 2nd grade our class saved Campbells soup can labels and the teacher sent them in so every kid in the class could get a Campbells soup mug. I still have mine, probably 46 years old and in great condition. This isn't mine but what it looks like.
About 26 years ago an older friend was selling a few bins full of old newspapers. The entire paper, Probably New York Times or New York Post, that include the stock market crash, Pearl Harbor, July 4th 1976, JFK assassination, and many other important dates. Plus I still have all my news papers for the GWB "Hangind Chad" fiasco, every paper from election day until they finally settled the vote count in Florida.
In 1994 I went back to Kentucky for deer hunting at my sisters 80 acres. A friend of hers said we could hunt on her larger property because we only got 1 deer out of 4 of us in the 4 days we had hunted. The friends property had a very poor shape very old farm house, nearly falling down, and we were looking through it. I found several 3x5 cards filled out explaining someone either donated the war or bought war bonds, but the amounts listed were varying amounts like $1.67, or $1.31. Obviously whatever spare change they could afford that week/month. I have a handful of them stashed somewhere, I will find them one day if I ever finish this house and go through stuff in storage.
When my cement floor was poured in 2015 I scratched my name and date in 2 places on the garage floor. I always thought about writing something inside my walls before insulation and drywall but never did, but before I do the kitchen cabinets, and maybe a couple other things around the house, I will type out a letter explaining the why and how of the build process so it can be found many years down the road.
When cleaning out my parents house after my mom passed I grabbed an old washboard, still in decent shape, an old bottle of starch for ironing, my dad's old wind up phonograph that he built a mount to attach to his old 1947 wood/canvas canoe he had made so he could listen to music while canoeing around Belle Ilse in Detroit back in the late '40'sand early '50's. I also have the canoe, and the receipt for when dad bought the canoe. Sadly there is little information about the canoe but I believe it was custom made by the seller that owned the place in Detroit where dad bought the canoe. There are many other old things I can't recall right now. When I get around to sorting through all them I will put a label on everything explaining where it came from and about how old it is and urge the kids to keep them in the family.
And finally, although they are now old, because they were made in the late 1990's, I have some 3'x4' blueprint type prints someone my brother-in-law knows made up of a family tree of "everyone" important from biblical times. I haven't looked at them in several years but I think it was from Adam & Eve to the birth of Jesus, but not sure. It is the result of someone's serious study of the bible. If anyone is interested I can try to dig them out, but not sure how buried they are in storage.