Cache is not at posted coordinates. Instead, you're going to need a few things to find it; a couple of flashlights and darkness. A big flashlight and a little one? Umm, no. A bright flashlight and a dim one? That's not it. OK, how about a right handed flashlight and a left handed flashlight? Really?
O-o-o-p-s. Almost forgot. You're going to need this too. Reverse Wheirgo Cartridge-Download me. Thanks, Waldmeister.
Stand near the posted coordinates, turn on your flashlight, and............go!