Legal analysis: the seizure list is in triplicate, and the registration and preservation list is in duplicate. Indicate the name, number, quantity, characteristics and source of the property or documents, which shall be signed by the investigators, holders and witnesses, one for the holder, one for the custodian of the public security organ and one for future reference. The seizure of a criminal suspect's mail, e-mail and telegram shall be approved by the person in charge of the public security organ at or above the county level, and a notice of seizure of mail and telegram shall be made to inform the post and telecommunications department or the network service unit to hand over the seizure.

Legal basis: Article 230 of the Procedures for Handling Criminal Cases by Public Security Organs shall, together with the witnesses present and the holders of the seized or detained property and documents, make a list of the seized or detained property and documents in triplicate, indicating the name, serial number, quantity, characteristics and source of the property or documents, which shall be signed by the investigators, the holders and the witnesses, one for the holder and the other for the holder. If it is impossible to determine the owner of the property or documents, and the owner is not on the scene or refuses to sign, the investigator shall indicate it on the list. Those who detain cultural relics, precious metals, jewelry, calligraphy and painting and other valuables according to law shall take photos or make audio and video recordings, and make timely appraisal and evaluation. When sealing up or detaining, necessary living expenses and articles shall be reserved for the criminal suspect and his dependent relatives. Under the condition that normal investigation activities can be guaranteed, the parties concerned may be allowed to continue to use the property involved reasonably, but necessary measures shall be taken to preserve and increase the value.