Kirby, thanks very much for your responses to my messages re: Leeper and Reeder. I have been working with a professional genealogist in Washington, who specializes in NARA research, and her conclusions are much the same as yours. We are going to attempt to locate the original copy of Reeder's report re: Mingo Swamp, simply because it would be interesting to see.
Best Regards,
Cynthia