This is part of a series being placed by many geocacher's along the Flagstaff Loop Trail.
The South (S) and Southwest (SW) section caches have codes that lead to a S-SW Quadrant Mystery Cache. These codes will not be in all of the S-SW caches but randomly placed. Look for codes A,B,C,X,Y, and Z to locate the S-SW Mystery Cache. There will be a code in the FLT S-SW Quadrant Mystery Cache that will lead to a Final (Golden Egg) Mystery Cache. So save/remember any code you find in a Quadrant Mystery Cache.
Since this series is being placed by many geocacher's it may take several months to complete the entire Flagstaff Loop Trail series. Happy Caching.
Most GPS Co-ordinates in this area seem to bounce around by 30 or more feet. Look around when you get close to GZ and you should have success.