Burial records are usually not found in the Compiled Service records received from the National Archives, of Confederate soldiers. We also have access to these records on Footnote. No burial records for Pvt. Sanders are found there.

Burkeville being some 40 miles West of Petersburg, I would doubt that his remains would have been removed to either Petersburg or Richmond.

I would assume he was buried in a cemetery local to the Burkeville, Va. Wayside hospital. I would therefore suggest you submit an inquery on the Virginia Message board re Burkeville Confederate hospital burials.

Most likely his grave was never marked, or if so, the marker disintegrated long ago. For information, some 15,000 unknowns are buried at Oakwood in Richmond.

There are no records at the National Archives for the Burkville Wayside Hospital nor at any other location.
[The Confederacy, A Guide to the Archives of the Government of the Confederate States of America, NARA, Washington, DC, 1986]

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Private Wiley Sanders, Company F, 47th Alabama Infantry, near Petersburg June 21, 1864, received a gunshot wound , to the leg which was amputated, admitted Wayside Hospital, Burkeville, Va. with amputated thigh, June 22, suffered much . . . . & finally died from diarrhoea October 1, 1864

M311: Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Alabama