I know this does not provide direct assistance, but I would recommend that in researching burials, you research the regimental medical records, sometimes (though not often) there will be burial information or that family came forward to claim body. The standard practice of the day, was for each Regiment, to have a Regimental Hospital System. Each company would have had a Regimental Hospital tent, with nurses, and one or two stewards. The Assistant Surgeon would travel to treat soldiers from each of the companies. If it was serious illness, or wound, or injury, they would have been sent to the post hospital. Many times, before being transferred to post Hospital. The regimental Hospital. would have the dead soldier buried in a supposedly temporary grave, near the hospital tent. The regiment and company records often do not include any burial information. My understanding, late war, the post at Helena, began trying to consolidate all burials in a post cemetery. Prior to 1864, it is possible they were buried in the regimental cantonment area. hope this information helps.