The cache IS at the posted coordinates, however to log this cache online, you must have first found 20(TWENTY) caches that have the "Watch for Livestock" attribute. You may find and sign the log at any time, but do not log online until you have satisfied the challenge.
To log this cache...
Find TWENTY caches that have the "Watch for Livestock" attribute.
Prove this however you see fit...bookmark list, GSAK or just email the GC codes. It's all up to you.
You CAN find and sign the physical log at anytime, but DO NOT log online until you have satisfied the challenge.