This is from a website that was built years ago and contributed to by three very detailed researchers, all three of whom have passed on. Bryan Howerton amassed a huge amount of Arkansas Confederate records and these were part of it. Not sure as to his sources. The two slaves were both in Company E and were listed as last paid in Aug of 1862. However, I have not found their records in the CSR's so Bryan may have other sources he located. The report in full by the Union receiving officer is listed
"All the CSRs of the men who were captured 11 Jan 1863 at Ark Post, AR, sent to MP at Camp Douglas, IL then delivered to City Point, VA 10 Apr 1863 bear the following notation: " City Point VA. April 10, 1863. "Received this 10th day of April 1863 from Cpt A. Bartlett, 9th Ver. Vols. USA (520) five hundred and twenty confederate prisoners of war and one Negro Boy, stated to be a prisoner of war.' J.H. Thompson, Commanding at City Point, VA."