Thought I'd revive this. Just drilled out the lock on my newly aquired Liberty Bell. Found four Penthouse's, two Hustler's and a Playboy. All from the late 80's. Also found some film negatives (nothing weird), some Poloroids (again, nothing weird) and old love letters. There was also an unused condom and a VHS tape labled "Kelly's Heroes, The Living Daylights and The Cowboys." I doubt those movies are what is on there. The tape was really moldy and I don't feel like setting up a VHS player (I think I still have one) so we'll never know.
Oh. Also found mouse poop.