If the box turtle was found in or around Columbus, Georgia, there's a good possibility that it's an intergrade. I'm looking at the distribution map of T.carolina subspecies in my copy of Turtles of the Southeast (by K. Buhlmann, T. Tuberville & Whit Gibbons)... On the Columbus side of the Chattahoochee River, there are Eastern box turtles, but it isn't too far north of where you find Gulf Coast box turtles in the Florida panhandle. On the other side of the Chattahoochee River (in Alabama) are three-toed box turtles.
I'm leaning more toward the turtle being (primarily) an EBT, but I'm also seeing a little bit of GCBT influence (in the shell pattern and the head profile).
Can you show us a picture of the turtle's carapace from above? I would like to see if there's any sign of the telltale GCBT flare toward the back... On the turtle's left side, anyway, since that side is still intact.
How is he/she doing?