Record of Deposit Received by Mail Express October 5, 1909 - July 7, 1934.
U.S. National Archives (Record Group 104 [Denver]) (1909)
Denver Mint records scanned at the National Archives (NARA) in Denver - covering the period 1909 - 1934. Record group 104. Information resource name and date range: “Record of Deposit Received by Mail Express, Oct. 5 1909 - Apr. 24 1914.” Courtesy of John Graffeo.
NARA description: This series consists of records of deposits received by express mail. The records include the dates the mail was received, the amount of the deposit, and a brief description of the transaction.
The NARA catalog entry is https://catalog.archives.gov/id/2674936.