The house I am looking to buy for renovation has evidence of termite damage in the wood behind some exposed exterior siding. The electrical box has been partially pulled off the house and you can see the tunnels in the wood underneath. It looks really old. The seller says he's not seen evidence of a current infestation since he bought the house five years ago and, as he works for a pest control operation, he's had the house treated. He says he'll have it retreated before we buy it. If the damage is old, how much is too much. None of the walls are exposed for us to see. Is it simply a gamble?