The only names I find that resemble Faulkinberry buried at St. Louis & Jefferson Barracks, MO are listed as:

Falkinberg, G.W. Pvt. 34 ALA K 5/31/1862

Faulkenberry, E. Pvt. White's 12 Mo. Inf. C 5/21/1863

Frankelburg, Gustave 5/9/1863

The only soldier I find identified as 49th Alabama is:

Grayson, John C. Pvt. 49 ALA INF H 5/1/1862

The only soldier I find with a burial date of 4/15/1862 is:

Mothershead, Simon 21 Ala. F