12 U.S.C. § 122a: Redeemed notes of unidentifiable issue; funds charged against

Federal Reserve bank notes redeemed by the Treasurer of the United States under section 121a of this title shall be charged against the balance of deposits for the retirement of Federal Reserve bank notes under the provisions of sections 122 and 445 of this title; and charges for Federal Reserve notes redeemed by the Treasurer of the United States under section 121a of this title shall be apportioned among the twelve Federal Reserve banks as determined by the Board of Governors of the Federal Reserve System.