25 CFR §162.111

1. (a)Records associated with this subpart are the property of the United States if they:
   1. (1)Are made or received by a tribe or tribal organization in the conduct of a federal trust function under 25 U.S.C. § 450f et seq., including the operation of a trust program; and
   2. (2)Evidence the organization, functions, policies, decisions, procedures, operations, or other activities undertaken in the performance of a federal trust function under this part.
2. (b)Records associated with this subpart not covered by paragraph (a) of this section that are made or received by a tribe or tribal organization in the conduct of business with the Department of the Interior under this subpart are the property of the tribe.