I'd agree that it looks like a Russian Tortoise. I took care of three one summer. I don't know what their permanent habitats were like but I just had them in tubs with dirt as a substrate and a water dish. That's what the owner had me put them in the two females in one and the male in another. They ate romaine lettuce and he said they also enjoy dandelion leaves. Good luck with the research and the vet visit, those tortoises are awesome!