When I was a teenager I worked in a movie theater that no longer exits. We were cleaning up the basement one day and discovered a stash of movie posters ... probably somewhere in the 200 poster range.

finds ... that were not suppose to exit ... my understanding at the time, was that movie posters were suppose to be destroyed after the movie finished showing.
I remember seeing posters for "Gone with The Wind" ... "Billy Jack" ... "Dirty Harry" .... some Elvis movies (don't remember which ones) ... and others.