I received a cp2000 notice. I agreed with them, but here is a technicality. On the response form it says: send it to us in the enclosed envelope.... Use the provided voucher to ensure proper application of your payment. But the address on the voucher is Fresno, CA 93888 and on the form 310 Lowell St, Andover, MA 01810. If I send them together, which address should I chose? I hate to send the response form and the voucher to two different places.