The posted coordinates will bring you to an intact portion of an old fence. Using items that you count from/on this fence you will create a three digit number, lets call that number "X". Count items only from the intact portion of this fence.
X = (Staples*)(Posts)(Rails)
*count the number of staples on the easternmost post which are securing a steel cable
This cache can be found at:
N41 38.(X-321) W88 29.(X-448)