I suspect my acquisition of my 1/4" Craftsman socket set/Permanex box will
trump beat anyone else's.
I was free-diving/snorkeling between the second and third reefs in the Atlantic Ocean, south of Ft. Lauderdale. I was spear-fishing with my venerable Hawaiian sling for fish and a net for lobsters. I got some yellowtail snappers and several lobsters, and was getting ready to return to shore, when I spied something out of place on the sandy ocean floor, between reefs. It was a pile of hand tools! I swam down to take a look, and they appeared to be a recent arrival. I spent my time retrieving all the pile placing it in my catch mesh bag. I tied it off my lanyard for my dive flag, and began swimming back to shore. The bag was too-heavy to carry, I just dragged it across the ocean floor which was mostly sandy, until I got to stand-up shallows, and I brought it to shore.
The bulkiest things were the Craftsman plastic 1/4" toolbox and a 3/8" VSR hammer drill. It looked like the Skil drill of that same type. There was a neat hexagon prybar, a two-grade whetstone, Craftsman screwdrivers, a red plastic Craftsman drillbit set, all there; a couple hole saws and a mandrel, quality ones; and some other things I cannot recall. This was nearly 30 years ago.
I rinsed-off everything, including the electric drill, which I disassembled, and doused with WD40, and the tools also got the WD40 treatment. In the end I decided that someone had been trying to do something to their boat, a 'flying-fix,' and they dropped their toolbox contents overboard. There was no metal, plastic, or cloth toolbox/toolbag with the 'deep-six' tools. Everything was in a central pile on the ocean floor, less than 20 ft depth at that far out from the shore. There was no algae, no barnacles, nothing to show the tools had been there for a considerable period of time. The die-cast pieces in the electric drill showed no signs of corrosion. After letting it dry-out and getting the WD40 treatment, it even ran, though the brushes were ozone-generators (sparks).
The 1/4" drive Permanex case has a date code of 1994. I've added a few things to the case, and it hangs on my wall above my workbench, and I use its contents frequently. Same for some of the other pieces, others lurk in toolboxes awaiting their need.
The internet isn't cooperating on posting pics, so that will have to wait, meanwhile, my story about
Davy Jones' locker/toolbox will have to suffice.

OK finally was able to use my cell to get a flipped photo in