Hi everyone!
I finally figured out what that paper was. I was flipping through it taking photographs and realized it had been opened at the advertisements the vaudeville gags was advertising practical jokes and the likes. Once I got it turned around the correct way.. it is a Mutt and Jeff on Their Honeymoon sheet music from the 1920s!! Which is rather cool and goes along with the time period of the books and letters I found.
Its been a day.. I also left my camera there ugh so all week with out it.. and I am keeping my fingers crossed no one decides to break in and steal it.