Vicksburg couthouse museum only had some unidentified photos of a few of those troops in Vicksburg and don't think NPS museum at the battlefield had anything much either as I remember from my visits to both..
I do have the NARA file on this unit. My g.greatfather was a 1st Sgt in Co H Aug 63-Jun64 when he received a disability discharge and then got well and became the QM Agent on Is. #98. at $100 a month.
Any help appreciated.