It's just a baby, that's why. We really won't know what kind of box turtle until it starts to develop the pattern on its carapace. Right now I'm thinking either 3 toe or eastern, but will have to wait a year or so to see.
Check your laws on keeping box turtles because some laws say not to . If he came from the wild that's the place he needs to be . put him back as close to where you found it . We need wild box turtles to carry on the gene pool. We are losing wild box turtles due to habitat destruction . So the more wild babies the better .
In Georgia, it is an Eastern (Terrapene carolina carolina) and they are illegal to possess. I'd let the little one go exactly where you found it.
--Berkeley