Cache isn't at the posted coords. Solve the puzzle below to get the final coordinates:
You can validate your puzzle solution with certitude.
Congratulations to jasperdakota for FTS (12 minutes after published) and FTF (1 hour after published). I'll have to make my puzzles harder :-)
Ovfba ghor va pbeare bs fbhgureazbfg jbbqra senzr, uvtu hc.