I just got back from the store, where I bought bananas and other fruits. I own a box turtle farm, and part of their diet is a variety of fruit. They really love bananas, but they can only eat them in moderation. 
That's pretty cool! What is it like to have box turtles as pets?
I enjoy it! They have pretty complex care requirements though. For example, without the right diet, they can develop a vitamin A deficiency and get frequent respiratory infections.
Poor things. They seem pretty great though. I heard that it's difficult to tell the genders apart since those parts are inside the shell, but females tend to be bigger than the guys.
They can be! Sometimes people don't realize they have a female until the turtle lays an egg. Another known method to try is looking at the turtle's eyes; males usually have red eyes and females have brown eyes. 
You seem very knowledgeable about your pets, which is great. The plastron is also a great way to check if it is male or female. The male's have the plastron behind their hinge.
Yes, that is true, too. Females also typically have longer rear claws. Do you know why?
I'm not sure exactly, but I'd love to know. The carapace on the box turtles have 38 scutes- that much I know
Females are responsible for building the nests, so they have to use their rear claws to do so! They typically prefer to dig their nests in the evening hours. 
That's pretty cool. I love how animals are so unique. I know it's weird to say, but I think the mating process of the box turtle male getting on top of the female's top body is pretty funny
I suspect my box turtles will begin mating soon. They generally start in the spring and go into the fall. I have 5 females, ready to go.