This Bonus Cache is NOT located at the posted coordinates. In order to find it you must first find its three feathered friends, Cardinal, Oriole, and Blue Jay. Don't worry, they are nearby.
In finding the three above noted caches, the coordinates for this Bonus cache will be obvious from clues located on the cache log, and also duplicated in the Chirp messages along the way.
Once you figure out which numbers A, B, C, D, E, and F represent, then the below coordinates will be complete!
N 30° 26.ABC'
W 97° 40.DEF'
Note: This Bonus Cache doesn't employ a chirp device, but the three caches needed to locate the clues for this bonus do, hence the name.