Hoo's Watching You? Mystery Cache
offline.cacher: Obviously not a good place for a cache.
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Difficulty:
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Terrain:
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Size: 
(small)
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There is no puzzle for this one, but a couple of searches.
This is a good course or refresher course in stealth. No matter what time you attempt this one there will always at least one pair of keen eyes watching you. For the full experience that this cache offers 1. Find the cache 2. Send me an email telling me where you were being watched from (What letter?) (While part two is not required it is strongly recommended for the full effect of the theme.)
Congrats to cphug184 for the cache FTF and to csouser for locating “Who” first, well done.
Finders of 'Who."
csouser, marmon69, twister69, akpatty, WWCD, Bubba Q. Jack, The Goffs, Bocco, Gaiter Man, TM2, Milomarvelous, jb71, Pengie123, StarryEyeGuy, karo92, UNDER Vito, Serrabou, Penny's pack . Hoo will be next?
Additional Hints
(Decrypt)
[Part 2.]
1. Ybbx 315 sg Abeguvfu
2. Ubb Ubb.