The cache IS at the posted coordinates. It is not an ordinary cache it is a challenge cache. To qualify for this cache, you need to meet the following challenge and sign the log before you log a "found it" log online. The challenge is this: On your D/T chart (difficulty/terrain chart) you need to have found at least one cache in 73/81 different D/T categories = approximately 90%.
I know sometimes it is hard to find the final few D/Ts as they are rare, so I thought I'd give you some recognition for getting REALLY close!
The difficulty/terrain rating is based on the challenge, not the hide.
Project-GC Challenge checker