To get the cache coordinates you have to found Mickey Mouse. Mickey is less than 25km from the posted coordinates. Put the coordinates to checker and you will get the final coordinates. Be careful of muggles when searching the cache.
[Mystery:] Terra / Ivuerä + Nofgenpg / Nofgenxgv
[Cache:] Fcehpr evtug arkg gb gur fvqrjnyx. Hfr fgrnygu vs arrqrq / Xhhfv xäirylgvra ivrerffä. Uhbznnznggbzhhggn rgfvagääa.