Thought you might like to know Ole Miss. has in their special collections a letter(s) described below--

W.R. Burris Letter. April 12, 1865.
(MUM00922). Burris was a member of the 3rd Mississippi Cavalry, Co. B. Written from Fort Delaware prison camp to his father, Edward Burris in Waterford, Mississippi. In the letter, Burris tells his father that he has recently been paroled and expects to be home soon. (1 folder).

http://www.olemiss.edu/depts/general_library/files/archives/guides/civilwar.html

I am in the process of ordering info from them, not sure what they may charge etc.

GP