Customs seal is not allowed to open, is to bear legal responsibility. There are two cases usually customs seal will be imposed: First, the customs out of the box inspection. Customs inspection is the customs officers to open the container, or all pulled out to view, in order to allow the owner does not think it is illegally viewed by others, sealed a customs seal told the owner, this is the Customs investigation. At the same time, customs inspection records must also note the customs seal number. Second, the customs transit. Customs transit is the goods imported from the port customs, forwarded to the inland customs declaration.