The cache is not at the posted coordinates - there's a white sign/post. Those are your clues to the final which is at:
What anniversary is it? AZ5 th
There are 2 years noted 179B and 201Y
N 39° 05.4AB W 084° 21.1YZ
Sum check A+Z+B+Y = 15
You are looking for a magnetic coverplate on a fence post.