Update October 2021: This cache is now just a normal traditional cache disguised as a puzzle.
Historical, no longer relevant
This cache is part of the Fall Favorites 2017 Challenge (FF2017). For more details on the challenge, see this Facebook Group.
The cache itself should be an easy find, but getting into the cache to sign the log could be a different story. With a little bit of patience and determination, you should be able to sign the log. Please do not block the mailboxes.
The following key may or may not be helpful to open the cache:
F = 1
O = 3
R = 4
C = 5
E = 2
This cache was won at the Maritime Mega 4, special thanks to Plumberman63.