Dear Mr. Peterson,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Correspondence, Reports, Lists, and Other Records , 1918 - 1920 in the Records of the Office of the Quartermaster General (Record Group 92), which includes records of the Motor Transport Corps and may include information relating to the 1920 convoy. For more information about these records, please email National Archives at College Park - Textual Reference (RDT2) at Archives2reference@nara.gov.
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We hope this information is helpful. Best of luck with your research!
Thank you so much for your reply and suggestions for researching the Motor Transport Corps records at College Park. I did not see that particular collection in my NARA researching.
I have followed up with them per your recommendation, and am hoping a copy of the 1920 Convoy's official report still exists! :-)