Yeah, I agree with Fernando. Definitely NOT a box turtle.
Good lord, I hope they have been feeding him like a box turtle. You better give him a warm water soak daily to help flush out the kidneys and other internal organs.
No, not Russian...Hermann's is closer to it. Maybe Egyptian but definitely not a Russian.
Hi and welcome to the forum...Can you post some better pictures of him? I agree with Tom about the soaking...
Looks like a Russian to me as well... better pictures would seal the deal. Definitely a Testudo tortoise though, and NOT a box turtle.
In the meantime, give this a read and it will help you get an idea of how you need to feed him and set him up, what kind of enclosure and other equipment he needs.
I've seen quite a few Russian tortoises in my time that were thought to be box turtles. Sorry Maggie...its a Russian tortoise. I only hope he's been fed quite a bit of greens, not too much fruit and no bugs!