This is a Challenge Cache and IS located at the posted coordinates. In order to claim a find you must have met the terms of the challenge. You may sign the log at any time and post a note on the cache page. Any "found it" logs that don't qualify will be deleted. There is a challenge checker you can run to see if you qualify.
I spotted this challenge in Texas and just had to copy it with a slight modification. Enjoy this.
The challenge is to collect 350 containerless geocaches. This includes Earthcache , Virtual Cache , Webcam Cache , Locationless (Reverse) Cache , Event Cache , Cache In Trash Out Event , Mega-Event Cache , Giga-Event Cache , GPS Adventures Exhibit , Groundspeak Block Party , Lost and Found Event Cache , Groundspeak Lost and Found Celebration, Community Celebration. You should use the checker below to see if you qualify.
No need to use the solution checker. It just won't go away.