Strangest thing found in your A body???
One thing weirder than finding the smut under the rear seat of my dart from the 70s was not a-body related, but I bought a used 2004 Pontiac Vibe 5 speed from a dealership, and it was a great car while it lasted. I drove it home, the neighbors all wanted to see it, and we were messing around with the seats folding them down and talking about how it'd be a great camping car. I found a hidden storage thing behind the spare tire cover, and opened it.
Inside was about 20 different knives and a single pair of black gloves. These were large knives with fileting ends and such. I didn't know what to think of it... so I got some plastic bags, wrapped em around my hands and pulled them all out and put them in a big cardboard box. About 2 hours later the dealer called, and said "the previous owner just mentioned that there was something in the car he inherited from his father, and he said you maybe found it, but didn't sat what it was"
I drove over the to dealership and dropped off the box of knives. The dealer looked a bit weirded out, but oh well - murder stuff was his problem now. Drove that car for 3 years and the cops never asked about it so I guess I was good.