The cache is NOT at the posted coordinates.

This is the bonus cache to the Adventure Lab – “Found on The Sound", which is described as follows:
Mr. G. O. Cacher likes to hang out on the rooftop of a restaurant here on The Sound. It is a good place to say ‘Greetings!’ to any geocachers that happen to walk by.
He recently learned of a bonus cache hidden nearby, but its exact location is a mystery. He heard talk about a ‘secret lab’… it is an ‘Adventure’… and there were 5 places to visit. Someone else mentioned finding a ‘journal’, and how suspicious looking letters and numbers just ‘magically' appeared on the pages of the journal as each step of the adventure was completed.
Mr. G. O. Cacher is quite puzzled by this geo-talk, but he likes puzzles! He suspects that perhaps, just perhaps, if the suspicious looking letters and numbers were to be placed in the proper order, they would reveal the location of the bonus cache!
Mr. G. O. Cacher is ready to undertake this geo-adventure! He also thinks it would be more fun to go with a geo-buddy, so is hoping you will go with him.
Will you? Will you be Mr. G. O. Cacher’s geo-buddy today?
Yes? Woohoo!
https://labs.geocaching.com/goto/FoundonTheSound .

Congrats to TXvR for a speedy FTF!!
How do you find an Adventure Lab?
To solve this puzzle (and other adventure labs), you will need the following app for your compatible device. It is a free app that works on both IOS devices or Android devices but has not been tested in other operating systems. The app is maintained by Geocaching HQ. As such the functionality is not guaranteed by the reviewer or by me, the geocache owner. Download this app at your own risk.
Adventure Lab App:

You can validate your puzzle solution with certitude.