One last Christmas Mystery

One last Christmas Mystery....When I got home and picked up all my mail, there was a mailing tube addressed to me, no return address. Inside was a nice poster of the six Union Pacific 'heritage fleet' locomotives. These are Union Pacific diesel locomotives painted in a likeness of acquired railroads (the Katy, Southern Pacific, Missouri Pacific, etc.) whose names are no longer shown.

The poster was sent from Saint Louis, but there was no note or any information from who sent it. I guess the spirit of Santa Claus lives on.