Since I'm older, I've found more tools, I guess. Couldn't begin to list them all.
Main place I find tools is in used cars and used tool boxes. Every time I buy a cheap car to fix up (hobby work) I find tools. Since I get most of them from middle men, tow drivers and shops, I never meet the car's owner, so those tools are just part of the profit.
When I buy a used tool box I always ask 'OK to keep anything I find?" and about one in five will check the box right then, and always pull a tool or two that was left. The others say it's OK, being sure there are no tools in the box.
There almost always are.
I've pulled brand new half inch drive Craftsman ratchets, used ratchets from everyone except SnapOn, many, many wrenches, sockets, extensions, chisels, dikes, pliers, etc. Last big haul was an Ingersoll Rand valve grinding air tool.
I have an entire box, about 50 lbs, of assorted tools, the IR tool was in the box, and I actually haven't even sorted the box yet. Saw wrenches, sockets, brand name, and lots of small tools I haven't really looked at in there.
Will get to it when I get time.
Lots of tools in the Pick-a-Part but they are almost always under the carpets or seats of cars in the yard. The yard dogs clean out most the tools before the cars are put on the lot, but they miss some.
Only tools that I ever kept that I may have been able to track down the owner was a couple of SnapOn wrenches, worn, that were left in a motorhome I was having repaired on a recall. The mechanic made a mess in the interior, (where he wasn't supposed to be, the rear end was being changed, and left loose bolts on the axles. I found the wrenches, greasy, laying on the carpet. I think he went inside and used the toilet... left the wrenches. I had to use one of them to tighten the bolts he missed about 400 miles further down the road. I had intended to mail them to him, but after finding the loose bolts he's lucky I didn't return to the town and feed him the wrenches...