You need to contact a group called SHAPE to see what they can do to help you with this. You will find out more about the letters and George Cox's name is listed as one of them at their site. http://confederatepows.southernheritageadvancementpreservationeducation.com/page.php?2 The lady that is credited with doing alot of the transcribing is on this message board.

I don't understand how someone would have the envelope if the letters were left behind when the "mail carrier" was arrested.