Dear Mr. Cashman,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Record of Headstone Contracts and U.S. Soldiers' Burials, 1861 - 1903 that may contain the information you seek. This series is in the custody of the National Archives at Washington, DC - Textual Reference (RDT1). For access to and/or copies of these records, please contact RDT1 via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your family research!