The cache is NOT at the posted coordinates.
To solve this mystery, you must complete the
EGADs, Not Another Adventure Lab Adventure Lab
to obtain the coordinates to this cache.
If you haven't already, begin by downloading the Adventure Lab app from Groundspeak. Once you have the app installed, begin the EGADs, Not Another Adventure Lab Adventure Lab.
Complete all 5 stops in the EGADs, Not Another Adventure Lab Adventure Lab and the coordinates will be available to you in the final journal.