The final is NOT at this location.
This is the bonus for the Joseph F. Glidden Homestead Adventure Lab.
Joseph Glidden and Phineas Vaughn were quite the business partners. Phineas' blacksmith shop still stands across the street (across Rt. 38/Lincoln Highway) from this final location. I've been told that a horse shoe has been embedded in the sidewalk to honor Phineas. After you find this mystery cache, you'll have to go across the street and see if the rumor is true!
The final is at N 41 55.A B C W 88 45. D E F