(a) Records are the property of the United States if they:

(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) Evidence the organization, functions, policies, decisions, procedures, operations, or other activities undertaken in the performance of a federal trust function under this part.

(b) Records 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 part are the property of the tribe.

(a) Any organization, including tribes and tribal organizations, that have records identified in § 166.1000(a) of this part must preserve the records in accordance with approved Departmental records retention procedures under the Federal Records Act, 44 U.S.C. Chapters 29, 31 and 33. These records and related records management practices and safeguards required under the Federal Records Act are subject to inspection by the Secretary and the Archivist of the United States.

(b) A tribe or tribal organization should preserve the records identified in § 166.1000(b) of this part for the period of time authorized by the Archivist of the United States for similar Department of the Interior records in accordance with 44 U.S.C. Chapter 33. If a tribe or tribal organization does not preserve records associated with its conduct of business with the Department of the Interior under this part, it may prevent the tribe or tribal organization from being able to adequately document essential transactions or furnish information necessary to protect its legal and financial rights or those of persons directly affected by its activities.