It's related to tax refund. 100% tax refund can only use FOB. If the customs declaration has been made, it is still very troublesome for the customs broker to change the bill. You'd better quote the difference between CIF and FOB in the next bill, because at the end of the fiscal year, the transportation fee must be consistent with the actual customs declaration and export, which is our usual practice. Be sure to declare the goods according to the actual situation next time.