A returned authorization number must be obtained from SigmaImpexInc during our regular business hours within seven business days of receipt of shipment. When calling for a return authorization number please specify refund or account credit (merchandise amount ONLY not shipping and handling). Used or misused merchandise, items without original packing or with price tags will not be accepted. All return authorization numbers will expire 30 days after issue date. Returned merchandise must be received by this date. The return authorization number must be written on the outside of each box being returned underneath the ship to address. A copy of the invoice or a letter listing items being returned with the reason for return must be included in the box. All returns must be pre-paid by the customer and returned to our warehouse at 2713 Merchant Dr, Baltimore, MD 21230. Returns made to our PO Box or any other location will be refused. All returns, refused shipments/canceled orders are subject to a 15% restocking fee. Unauthorized returns will not be accepted and will be returned to shipper at the expense of the customer. Buyer is responsible for all transportation and shipping fees on orders that are refused, returned to sender or undeliverable by carrier.