Hello Beth:

I'm afraid just because Samuel Neil and Mary Box were living on the Indian Reservation doesn't prove much of anything. Samuel was a farmer and may or may not have owned the land he was farming. I don't think the Reservation kept the occupants strictly to Indians. In the 1910 census they were still living in Umatilla Co., although in a different precinct, and Samuel was then a gold miner.

Couldn't tell if you are trying to prove Native American descent or not, but you will have to do more research on the subject. Perhaps find obits might help?

Gloria