As of 1889, it is possible to place Rocky Boy in Minnesota, as a signatory (as Ah sin e we ne nee, or Stone Man, age 32) of an agreement at the Red Lake Reservation. The age and name suggest a match, but it is unclear if he had been in Montana and returned to Minnesota, or if his initial trip to Montana followed this event.
US Congress. House. Chippewa Indians in Minnesota. Message from the President of the United States, transmitting a communication from the Secretary of the Interior relative to the Chippewa Indians in the State of Minnesota. March 6, 1890. — Referred to the Committee on Indian Affairs. HR Exec Doc. 247. 51st Cong., 1st sess., March 6, 1890.