Cache is not at the posted coordinates but is located very close by.

This is just a quick simple multi (QSM) to help fellow cachers who are working on filling their multi geo-calendars.

 At the posted coordinates you will see a three large boxes on post.  On the backside of the western most post is a nameplate.  Enter the serial number from this nameplate into the checker to get the location of the final cache.   Should be 6 characters.

You can validate your puzzle solution with certitude.