16 Sep 2019 Dear customer, Please be informed that the new function is implemented to check the AWB No duplication in China. You can access to this menu under the 'Services' menu on the top-right of the page. Input the MAWB serial number range up to 9999, then the list of the numbers used for shipments to China in recent 10 years. Also you can download the list from the page. Thank you.