From a letter I have from Topps:
"Your request should be mailed to 401 York Avenue, Duryea, PA 18642, attn: Consumer Relations. Please return your original request letter with copy of sales receipt, all wrappers from product, and UPC from bottom of box. Be sure to include your full name and complete mailing address, as well as a phone number where you can be reached. If you need further assistance please do not hesitate to contact us at 1-800-489-9149."