Per the U.S. Customs and Border Protection's (CBP) Cargo Systems Messaging Service (CSMS) #12-000479, when a Korea Free Trade Agreement (FTA) preference claim is made on an import to the U.S., an importer must have either the Certificate of Origin (CO) in its possession or the claim may be based on importer knowledge that the good is an originating good, including a reasonable reliance on information in the importer's possession.
According to General Note 33, Harmonized Tariff Schedule of the U.S. (HTSUS) and Article 6 of the Korea Free Trade Agreement, you must indicate which tariff rule was applied if applying product specific rules. Also, importer's basing their Korea FTA claim on a CO provided by the importer, exporter or producer should ensure that CO in their possession complies with Agreement.
For more information on this topic, please visit the CBP’s CSMS notice: http://apps.cbp.gov/csms/viewmssg.asp?Recid=19036&page=&srch_argv=12-000479&srchtype=all&btype=&sortby=&sby=
For more information, please contact your local FedEx Trade Networks Transport & Brokerage, Inc. office. For a complete list of office locations go to http://www.ftn.fedex.com/us/locations.