I don't know if they have anything, but after the war General Kirby-Smith taught (and is buried) at the University of the South, in Sewanee, TN. It's possible they have some information.

Also, UNC has a collection. See folder 51 about 2/3d of the way down: http://www2.lib.unc.edu/mss/inv/k/Kirby-Smith,Edmund.html#folder_51#1

Good luck!