From Fold 3---There are compiled service records for a Thomas Cox in “Confederate Officers” as follows:

Thomas Cox Capt & AQM appears on a list of quartermasters and quartermaster agents on duty in the Trans Miss Dept. The list is dated Feb 13, 1865
On duty-Washington, Ark
Appointed by Col G H Sweet on July 14, 1862

Cox, Thomas, Capt & AQM
15th Texas Cavalry
James Deshler’s command
J G Walker’s command

July 14, 1862-Appointed Capt & AQM, 15th Texas Cavalry
Oct 21, 1862-Relieved as Capt & AQM, 15th Texas Cavalry
Oct 21, 1862-Jan 11, 1863-Acted as AQM of Deshler’s Brigade until the fall of Arkansas Post
Jan-Aug 21, 1863- Capt & AQM, acting paymaster, Walker’s Division
____1864 Mentioned as Capt & Div paymaster, Walker’s Div
Memo-no other record found

From Fold 3---There are also compiled service records for a Thomas Cox in the 15th Texas cavalry including:

His letter of June 28, 1863, he writes the Confederate Secretary of War reiterating his appointments as Captain & AQM [as shown above] and asking for his commission and regular appointment from the War Department. He states that his residence is in Batesville, Independence County, Arkansas