In my 48 GMC 1/2 ton I found three air fliter housings off of v8 engines, door handles for a 70's chevy van(inside and out),fuses,missing headlight trim ring,taillight housings for the same chevy van,a few old wooden handle screw drivers,of course mouse poop, a good size birds nest in the upper corner behind the driver side and about a garbage can full of just trash!.
It looked a lot better once cleaned out.
Mel