deepsecrets:
The source for that yarn appears to be:
"Ghosts or Devils" I'm Done. By Francis M. Moore. Press of O.C. Cole & Son. Deadwood, S.D. 1908. The Startling Adventures of Two Officers of the 62nd Ohio Infantry on Polly Island, S.C., during General Gilmore's Siege of Fort Sumter in the War of the Rebellion, and the story which incited their adventure.
"This is what purports to be a true narrative of the experiences of Lieutenants Yocum and Hatcher of the 62nd Ohio Volunteer Infantry. It is weird and extraordinary and reminds one of Poe's imaginative creations." Quote from The Civil War Literature of Ohio a Bibliography. By Daniel J. Ryan.
It is long out of copyright, so if it hasn't been reprinted it shouldn't be too difficult to obtain a photocopy from an Ohio historical society or other library. I suggest you base your inquiry on your interest in Civil War history or the families of the gentlemen in the book - not on hunting pirate treasure.
Good luck to all,
~The Old Bookaroo