Knives in A bodies

So I am cleaning out a 72 duster today and under the seat is a 3 inch double edged dagger. Looks very old and its imprinted into the carpet like it's been there for years. (Car last registered in 1989)

I have a small bucket of pocket knives I have found in other A bodies over the years. There were 2 pocket knives in my 69 valiant, one under the seat and one behind the dash frame, I think it fell through the glove box liner.

So why would I find a pocket knife in almost every other car and what the hell would someone be doing with a small dagger in a duster??

Any ideas and have you found similar in your car?