The cache is NOT at the posted coordinates.
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Some of you will have trouble solving this because you are young whipper-snappers and some of you will have trouble solving because you are long in the tooth.
No need for a solution checker. You will either know you have the solution or you won't.
In addition this cache is on ASTL and geocachers must purchase a recreation permit available on the Arizona State Land Department's website in order to geocache there.