It cannot be proven to be true, because invoices can also be faked
I often see on the Internet that some people sell bags from Xianyu. According to the buyer's requirements, they have not been tested. The goods were sent to the other party at this stage, and then the other party replaced them with pirated ones and asked for a return. So from this point of view, Xianyu, as a trading platform, has the qualification to inspect goods. You can also check whether the goods sold by the buyer have been inspected for authenticity, whether there are invoices, etc.
What Xianyu should pay attention to when selling designer bags is that it is best to do the transaction in person, so as to ensure that he will not return the goods to you. If it is a mail transaction, you must also find out the mailing costs, calculate them clearly, and explain them clearly to him.
As for any brand of brand-name bags, second-tier brands will have discounts, while first-tier brands will not have discounts. However, you can go to Milan Station, where brand-new ones are much cheaper than specialty stores, regardless of brand.