MYSTERY CACHE NOT AT THE POSTED COORDINATES.

Solve this tricky sticky picky puzzle - South 37 26.???, East 143 54.???
Letters to numbers ???
Checksums: S=25, E=28.
***Congratulations to Snorkafest on FTF***
Chmmyr: Lbh ner ybbxvat ng 4 yrggref va gur vzntr bs gur gerrf, uzzz
Uvqr: Gerr onfr