We found the other 4 letterboxes in the Hogwart's School letterbox
series, but could not find the "password" box
(http://members.aol.com/_ht_a/drewclan/tower.htm). We found a
location which seemed to match that described in the clues, and even
found an "indent" in the ground that was roughly the size of a
tupperware container, but alas, not box. Anyone find it recently or
know of its status?