If the idea of an Indian agency gun appeals to you and makes a difference in your bid, ask the seller what documentation he has to support that statement. Does he know that Schop was an Indian agent of some kind? I thought that at that time Indians were not allowed to buy firearms, but my knowledge in that area is skimpy so others my educate me/us.
In general, such claims, like alleged ownership by a prominent person, are worthless without solid documentation.
Jim