I just coudln’t find the old thread on this board or any other - may not have used the right search terms, I don’t know.
Anyway, starting with Emperor Norton and his decrees, some friends and I came up with a story that explains how that letter stayed there for 70 years. Postal or Western Union people, how does it look? http://www.fanfiction.net/read.php?storyid=1687697
(BTW, mods, can you link this to the old thread I’ve been using search terms like Back, Future, seventy, Years, and so on and can’t do it)