I was getting my computer bag and water bottle out of van and saw this thing on the ground. A tad beaten, but it's not a data storage device as far as I can see. But was thinking it might be a fuse. Sorry, phone has lousy camera.
If you don't figure it out, keep it for a while, It may have come from some of your equipment. I'd keep it in a toolbox or some such for a while in case its absence is later discovered. Throw it out after a year so otherwise.