Statistics for occurrence #1 of “Captain Secret Service” in chapter 45 of Admiral David D. Porter, The Naval History of the Civil War.:

..., I hereby appoint . . . . . . . . . . . . . . . . a member of the secret service corps, to report to me at . . . . . . . . on or before the . . . . day of . . . . . . . . 1864. Thomas E. Courtenay, Captain Secret Service Corps. Confederate States of America, War Department, Engineer Bureau, Richmond, Va., Sept. 15, 1863. R. W. Dunn, having been selected for special service, is authorized by the Secretary of War...
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