I just probed and weighed it. I've got a 555 gram female. And her name is going to be Crispy.
My big concern with the vet is going to be lung sounds and breathing. With being burned, I am definitely concerned that there was some smoke or flame inhalation. I hope there's no permanent damage. You can see some of the scarring on the right side of the neck, just past the head. Especially in that first picture. They don't look overly fresh, but I don't know how old they are either.
I just find it so hard to believe I might have picked up something special at a pet store of all places. Those CHs and WCs are usually pretty picked through by the time they get to that point.