The coordinates are for the benchmark at the Granite County Courthouse.
In order to get the correct coordinates, you need to complete the Take a walk around historical Phillipsburg Adventure Lab.
https://adventurelab.page.link/36Wz
The container is a pill bottle type cache with room for the log and a few some trade swag items.
NOTE: Make sure to sign the cache logbook, as online "Found It" logs without a corresponding entry in the logbook will be deleted!