Gold Standard Mystery Cache

This is from a cache that a great puzzler named WeBeDnD wrote in the Bay Area. It gave me so much grief that I thought I'd spread the misery around. The cache is a pill bottle covered with camo tape.

Update 4/2/08: Thanks go to ZSteve, for pointing out two mistakes and another ambiguity. Assume 10 = 0.

R N Y 5 Q V X N Q R
2 E R Q X D R Y F D
T 1 N P R Q X B Q R
2 9 Q Q R P Q V Y 5
Q R 2 Q Q R 2 K Q V
Y 9 Q V X N R Y F K

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