The seller has to pay, if the copper, etc. was stolen after the inspection but pre-closing: the seller is responsible to turn the home over to you in the shape it existed after inspection. They have to take steps to secure and protect the house during the period pre-closing and, if they do not, have to set right or repair whatever happened during that time, to put the home back in the condition it was at inspection. If they did or will not, you could sue themfor "breach of contract": for violating their contractual obligation to turn over to you the home you agreed to buy in the condition your agreed to buy it in.