This was never listed on the main letterboxing website because I hid
a box at Arches NP that I didn't want the park service to find out
about.
However, they did find out about it and confiscated it. Sad, I know,
but Arches National Park no longer has any letterboxes. (There used
to be another one there, but the e-mail I got implied that that one
was confiscated as well.)
And please don't bang the employees of national parks--they're just
doing their job!
-- Ryan