Don't laugh, I was vacuuming the truck and found an extra screw under the rear seat... I don't see an empty hole anywhere. Any ideas what it belongs to?

Don't you know by now everybody has a screw loose...Don't laugh, I was vacuuming the truck and found an extra screw under the rear seat... I don't see an empty hole anywhere. Any ideas what it belongs to? View attachment 7408
I have some fasteners that look like that. They retain the rear fold up floor board to brackets and hinges on my Outdoorsman.Don't laugh, I was vacuuming the truck and found an extra screw under the rear seat... I don't see an empty hole anywhere. Any ideas what it belongs to? View attachment 7408
This would be considered a critical bolt, maybe a seat, safety sensors, seatbelt, floor tray, ect.....Don't laugh, I was vacuuming the truck and found an extra screw under the rear seat... I don't see an empty hole anywhere. Any ideas what it belongs to? View attachment 7408