43 C.F.R. § 4.628
(a) To obtain payment of an award against the Department or other agency, you must submit:
(b) If the award is against the Department:
(1) You must submit the material required by paragraph (a) of this section to the following address:
Director, Office of Financial Management, Policy, Management and Budget, U.S. Department of the Interior, Washington, DC 20240.