BIFf's an IDiot! Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(not chosen)
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The cache is not at the posted coordinates!
Doesn't matter if it's 1955, 1985, or 2015.
Biff's an Idiot!
He even tells himself he's an idiot!
Young Biff: "Why don't you make like a tree and get out of here?"
Old Biff: "It's "leave", you idiot! "Make like a tree, and leave." You sound like a damn fool when you say it wrong."
With that in mind,
Here's the puzzle!
RKREWD VUCBWO LFITSW
TSTEBI QXPKBG BNKCFQ GKZFII
You can validate your puzzle solution with certitude.
Additional Hints
(Decrypt)
gvzr zbivat sbejneq