Inside the crack is the serial number of this bag. The commodity number that can be checked for authenticity is usually marked after the logo name. If you are not sure, you can go to Beijing Siku luxury consignment shop for free appraisal. If you want to buy it, I know a second-hand luxury consignment shop in Beijing, where things are quite valuable. Generally, the second-hand ones are 50% to 70% off, the brand-new ones are 8.5% off and the fake ones are 20% off. Some white-collar workers in Beijing.