I've been trying to catch up today, and I've lost track of the exact replies. I believe you asked whether Graham mentioned the flags in "The Custer Myth."

He mentioned his belief that the regimental standard was packed away and carried with the pack train in a caption of the photograph of the regimental standard.

Graham's article, "Custer's Battle Flags" appeared first as the 1950 Los Angeles Westerners "Brand Book." In 1952, he reprinted it privately as a pamphlet. He presented a signed copy of the pamphlet to the NY Public Library for insertion into the appropriate volume of the "Brand Book," where it resided when I double checked it for my article.