On second look, maybe he IS a really, really old eastern who has lost his shell pattern. I see four toes on the back foot. Can I see a picture of his plastron?
Occasionally, three-toeds have four rear claws. I know, it makes no sense, but being a sub-species of the Eastern family, with past inbreeding, it happens. I've got a cousin with four toes, but that's a different kind of inbreeding...On second look, maybe he IS a really, really old eastern who has lost his shell pattern. I see four toes on the back foot. Can I see a picture of his plastron?
I think you might be right. He does have the ornate shape.I would guess a western box turtle