The posted coordinates are BOGUS, but are a place to start if you are choosing to complete the Adventure Lab from the Indiana side of the Bridge. (However, it is not the ONLY starting point.) In order to earn the correct coordinates, you must complete the Take a stroll across the Big Four Adventure Lab. The missing letters will be awarded with completion of stages of the lab. To access the lab you will need to have the Adventure Lab app downloaded on your mobile device.
The corrected coordinates are:
N 038 16.ABC
W 085 44.YZA
Please make sure you replace the container the same or better than you found it, or I can guarantee it will go missing. This is a high muggle area, so stealth will definitely be required.
The coordinates in the area seemed to bounce a bit, so a generous hint is provided.