I no longer know who the is in charge at the Old Court House Museum in Vicksburg, was Gordon Cotton for a number of years assisted by author Jeff Gimbrone who frequents the Mississippi message board. You might want to post a query there.
None the less, the staff is quite cooperative. I visited there last June with the descendant's of the 43rd Tennessee on our bi-annual reunion. Terry W. led us on a great battlefield tour.
George