The cache is not at the posted coordinates.
This is my first try doing something like this. I find puzzles interesting, though many of them are beyond my current abilities. This one I don't think will be very difficult. The cache is slightly smaller than a decon container.
04-1, 06-2, 12-2, 04-3
N 40 57.(X-2)(X+1)(4X/2) W 111 52.(X+4)(X/4)(2X - 8)
Ottendorf Cipher