I figured somebody would get around to asking that. I traded some chores he needed done around his house, and showing him how to do some stuff on his computer.
The story on were he got it is a bit more colorful. He lives on a main road going out of town and has since the 40s. Some guy came through (not sure what the date was) with "several" crates of ammo in the back of his car. Apparently it was "dragging" the ground. Had some kind of car trouble and to help get to his destination he left two wood crates of this ammo behind. Was supposed to pick it up on the way back, but never did. So it's been in the garage ever since.
This one came out of a wood crate with 4 other cans. Three more with 100% tracers and one of AP on garand clips. Found another can of tracers and a couple of half cans of AP in another part of the garage, along with the other wood crate shell.
Hopefully he'll need some more chores done.