We found this 11 years ago and thought we'd check up on it. The slanted post is now straight and we found no box amongst the concrete pieces or buried around.

Frabjous.

Finally found it, thanks to your help! After a number of hours studying the clues and two separate visits, and hints from you, we finally realized that we had made the mistake of gong to the actual frisbee 'hole' instead of the pro tee.
haha!

Oh well, the box is great, the stamp is awesome and we enjoyed the challenges.

Thanks again,
The Twinville Trekkers5
Tijeras, NM