Thanks for your input.
I would believe shipping Confederates north was a normal procedure. I do know many of my East Tennessee troops captured at Vicksburg were shipped north.
And as Alan points out, many of those who were later parolled were sent to City Point, Virginia for exchange.
Seems my intent of narrowing my searching of only troops in Virgina will have to be expanded!
When Grant in 1864 took over the in the East, exchanges were no longer allowed or extremely limited.