U.S. National Archives (Record Group 104, Entry 26, Gold and Silver Coins Reserved for Annual Assay, 1817-1838) Pubblico Deposited
U.S. National Archives catalog entry is https://catalog.archives.gov/id/566521. See also the National Archives & Records Administration numismatic finding aids at https://nnp.wustl.edu/library/archivedetail/538870.