Have found many things, in the fifties, I found a Cresent double ender wrench, a three pound ball peen hammer (that needed its handle shortened and re-installed) and a few other wrenches that are still used today.
In the seventies I found a six inch vise (Record) with the front jaw broken, got it welded and used it for about 25 years. It finally broke again, so I inquired at Princess Auto about parts, and was informed they have/had a lifetime warranty (on Record vises). I explained the circumstances (fully) but still walked out of there with a new one.
Have found tape decks, CD players, computers, and more. Used the code from one computer to install and validate XP on a spare basement system, that I use to play/copy music.
Most recent good find was a 1.14L of un-opened bottle of Crown Royal in a local park. Not being a big fan of that, took it back and traded for a jug of Iceberg vodka (plus $2).
Wife and I exercise by walking our neighbour's dogs around local parks and school yards. I ride my bike and last year brought home $1000 worth of cans and bottles (beer,whiskey, wine) Year before the tally was $1600 (was a hotter year). Just used to ride right on by all that kind of stuff......................
The world is full of discarded stuff, if you have time to slow down and see it..................I do now.