I vote for snapper too. I have them occasionally show up in my yard and they are not real close to water unless they are coming from the neighbor's pond. They are usually fair sized. The last one was in the neighbor's driveway and my daughter asked me what it was. It was black (been in the mud somewhere.) and smaller than the others but had an attitude. I think it may have been an alligator. I poked a stick at him trying to get him out of the drive and he snapped it in two. He also threw his head back over his shell. I hadn't seen the others do that! I finally got him into a big flower pot and hauled his carcass down to the river. I did have for a little while 2 baby snappers . I found them in the garden. About the size of a silver dollar. They were cute for awhile but finally I took them down to the river.

Yes, both are Box Turtles,the lighter one is certainly a boy, and the darker one might be a girl. Sometimes this can cause color variations, but often it is just genetics, sort of like in humans. Sliders (and Cooters, and other water turtles in that family) have much less domed shells, probably for pushing through the water, plus, they can get much larger.

I don't think the Painteds have the serrated edges on the back rim of their shells and the yellow with large black spots at the underside midsection lean me more towards a Yellowbelly.

You might want to post on the Home Decorating forum along with some photos.