The cache container is NOT at the posted coordinates. Do not go there.
This cache is a bonus cache for the Adventure Lab "FUN Adventures at Grandscape". There are 5 stages to the adventure lab and as you find those locations, you will be provided with letters and numbers to find this bonus cache.
You will need the Adventure Lab app for your device. It is a free app that works on IOS or Android devices. The app can be downloaded from the IOS or Android app store.
You must sign the log to the bonus cache to claim this find. FTF prize. Bring your own pen.
The location of the bonus is N 33 04.ABC W 96 52.DEF