Does the subject want to ask, "What is the reason why the security code in the gold electronic insurance policy bought in Chow Tai Fook's store cannot be verified?" It's fake. When you buy gold at Chow Tai Fook Store, the electronic guarantee issued is valid without an invoice. But you can use the security code on the electronic guarantee to check the authenticity. Enter the security code, and it will be considered as a fake. Chow Tai Fook is one of the most famous and largest jewelry brands in Chinese mainland and Hongkong.