Records of the U.S. Customs Court and its predecessor the Board of General Appraisers are included among Record Group 321 at the:
National Archives at New York City
One Bowling Green, 3rd Floor
New York, New York 10004
A guide to the holdings of the regional archives is available at: https://www.archives.gov/nyc/holdings
A published description of the records is also available in the Guide to Federal Records in the National Archives of the United States, 1995 (http://www.archives.gov/research/guide-fed-records/index.html ).
Johnson, Jed. "The United States Customs Court-Its History, Jurisdiction, and Procedure." Oklahoma Law Review 7 (November 1954): 393-415.
Lombardi, Joseph E. The United States Customs Court: A History of Its Origin and Evolution . New York: United States Customs Court, 1976.
Rich, Giles S. A Brief History of the United States Court of Customs and Patent Appeals . Washington, D.C.: Government Printing Office, 1980.