It is illegal to sell a mailbox to a fraudster, and then the fraudster uses the mailbox to swindle people. I suggest you collect relevant vouchers and call the police immediately. Those who defraud public or private property in an amount of more than 3,000 yuan, more than 30,000 yuan, more than 100,000 yuan and more than 500,000 yuan shall be deemed as "a large amount" and "a huge amount" as stipulated in Article 266 of the Criminal Law respectively. 3 the amount of fraud from 30,000 to 500,000 is huge. The amount of fraud is more than 500,000 yuan, which is extremely huge. All of the above are punishable.