The courier with complete personal information is actually bought and sold as a commodity, and the price is 4 to 1. According to a recent investigation by the reporter of Economic Information Daily, a large number of courier information of many courier companies, such as Shentong, Tong Yuan and Dayun, are being publicly sold at clearly marked prices, forming a huge "gray industry", which has become another important channel for citizens' personal information disclosure, and is a criminal activity such as fraudulent courier, burglary, robbery and murder.

Behind the vigorous development of the "gray industry" of express information transaction are the multiple hidden dangers of "leaking secrets" buried in the process of express circulation, and the various disadvantages brought by the "joining mode" to the management of express enterprises.