墨西哥能只凭提单副本提货吗？

有个墨西哥客户需要我们先寄一套副本单据（如下），到副本单据后再付款，会不会有什么问题啊？有风险没？ 1} comercial invoice { 2 copies} 2} packing list? ? {2 copies} 3} original copy not negotiable of original bl , for port to port and intermodal shipment. 4} copy of insurance policy from cargo transportation. 5} material test certificate mtc { 2 copies} 6} certificate of quality of the pipes {2 copies} 7} certificate of origin {2 copies}