Let's get to work! American Civil War prison camps

I found a prisoner of war in family he was confederate. Does anyone know if confederate prison records still exist??

Oliver Marion Butler, CSA Civil War Veteran

Billie

I found this relative in war prisoner records same unit different name. His Names James Westley Chapman but the War prisoner record under Jas W Chapman is this common???? I put all war records found but I hoping same person. Hackers creek has him in Andersonville GA Prison.

James Wesley Chapman, Civil War POW (USA),

Billie

I found a cousins family member while helping him with his lines that was POW if anyone like to help with profile it be appreciated.

Presley Monroe Gross

Billie