In 1975, the marker locations between Kinderhook, New York, and Alford, Massachusetts, were updated after new research, confirming theories originally advanced by North Egremont, Massachusetts, postmaster Joseph Elliott, found Knox did not pass through Claverack, New York. A new marker was added to the trail at Roxbury Heritage State Park in Boston in 2009, adjacent to a house owned by General John Thomas, who guided the weapons received from Knox to their final placement on Dorchester Heights overlooking Boston.