I have a strong theory that there actually 48 cards in the set, we just haven't seen them all.
Uncataloged is this Rebel Oakes. It has a similar stamp on the back as the Cobb that recently was discovered, and was definitely pre find.
BTW, some of the info in the REA writeup and the letter above is inaccurate. There are at least 2 Morgans, and I can account for 3 Crawfords and 4 Bresnahans in collections that I know of, including my examples. I"m sure there are more.