This cache was placed in conjunction with my event "Autumn - A Cacher's Best Friend" (GC73CRA). It won't do you any good to search at GZ - you'll find no clues or coordinates there. To find the coordinates for the final of this mystery hide, you'll have to do a little research from this cache page. Don't worry, it's nothing in the html code (though if I knew how to do that, maybe it would be).
GZ could be full of small muggles at times, so choose the time you search for this one wisely.