This cache is not at posted coordinates. Groundspeak has released a limited number of experimental Adventure Lab Caches. They are similar to the ones found at mega-events, with the exception that they will be available for a longer period of time, with the possibility of becoming permanent.
To learn the location of the bonus cache: Complete all five stages of the Adventure Lab. In the final journal entry you will find the coordinates for the bonus cache.
Mobile app smart link
Click the following URL to download the newest app from Groundspeak.
https://adventurelab.page.link/MHi7