U.S. National Archives (Record Group 56, Entry 169, Department of the Treasury, Letters Received from the Mint) Publique Deposited
National Archive entry group description: This series contains letters relating to the receipt of money deposited on account of the Smithson bequest; reports on the investigation of the New Orleans Mint; reports on the comparative value of foreign coins; reports on the examination of the books of the Treasurer and of the Philadelphia mint; lists of names and salaries of employees; requests for leaves of absence for officers of branch mints; records concerning the forwarding of bonds and oaths of allegiance of branch mint superintendents; appropriations for mints; transmittals of receipts from superintendents of branch mints for moneys received for salaries and expenses; certificates of deposit relating to the sale of medals; reports of coinage lots; records concerning the sales of nickel and copper residue and used equipment; and statements of minor coinage.
National Archives catalog: https://catalog.archives.gov/id/6210785