The poster was in a package marked from Britian 1986, with the addresses name Tony Freeman. Who is Tony Freeman? Well...he worked on Labyrinth as a Modeller!( and worked in Legend as a Sculptor too!)
So they it connects the "Tony, Thank you" to the Package.
Here is the Story behind him getting the poster:
Jim was suppose to sign off on something for Tony, so instead he signed the poster and gave it to him! That sounds like something Jim would do!
You know it is a real theatrical poster because it has the disclaimer on the bottom and you know it is old because it is just slightly starting to yellow because of its age.
I was skeptical at first but now i know its REAL!