This cache is not at the posted coordinates. The real coordinates to this bonus cache will only be revealed after you complete the fifth and final stage of the They Will Come From Space! Adventure Lab cache close to here. You will need to download the free Adventure Lab app from your usual app source. The app will automatically show you the Labs closest to you.
This is completely walkable. It's about a mile from here to this bonus. After you complete stage 5, pay close attention to the "Congrats" screen, which will show the coordinates to this mystery cache. If you close it by mistake, go back and view your "logs" on the adventure.
*I am reusing a container from a previous hide. Locals, please do not mention in your log where you remember finding it before.*
Please use stealth when retrieving, and replacing, the cache so you are not observed by cars, pedestrians or the homeless man who sometimes hangs out in the eaves of the building behind the host.
Congrats to Jbird and Zip for FTF!