Moyse's private papers consist largely of correspondence, and fall into four subject-areas: finance, associations and philanthrophy, literature and personal affairs. Financial papers consist of invoices for purchases, papers and correspondence regarding property purchases and taxes, and customs and shipping notices. Moyse's memberships in associations, particularly cricket clubs, is documented by correspondence and invoices for dues, as are his contributions to organizations such as the Y.M.C.A. and various hopitals. Literary correspondence concerns his own publications of fiction, as well as the publication ventures of others. Some are covering letters for manuscripts submitted for his criticism. Finally, his personal correspondence contain letters from Canadian and English friends, as well as McGill colleagues. Letters to Mrs. Moyse from their two sons describe their experience on active service during World War I.