The final cache container is NOT at the posted coordinates... But it is within 2 miles! But first, you will need to participate in the nearby Adventure Lab, "Northborough Places of Interest"! This 5 stage adventure lab will take you to several interesting spots in the town of Northborough, MA. Upon completing the fifth and final stage of the Adventure Lab, you will gain access to the last 'Journal Entry' which will contain the coordinates and a hint for this hide.
To play this Adventure Lab, you will need a smart phone with the Adventure Lab mobile app installed (which is a part of the Groundspeak family of games). You can connect the two apps using your existing geocaching username and password.
Mobile app smart link: Use the following URL... https://adventurelab.page.link/rehT - or use your phone's native QR code scanner to scan the code in the background picture I have uploaded