Sealed with a Seal Letterbox Hybrid
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Difficulty:
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Terrain:
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Size: 
(regular)
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This cache is part of the Trail of the Challenged and contains a clue for the final puzzle (GC3R2PX).
This cache is a letterbox. Can you guess what the stamp is? Far enough off the trail to not attract attention while you search and sign. It should also be accessible year round. Please do not remove the stamp or pad. If the pad gets dried out, the ink is water soluble. Add a few drops and you should be good to go.
Additional Hints
(Decrypt)
Ybbx sbe gur ebcr vs fabj xrrcf lbh sebz frrvat gur pnpur