If the liberty and custody judge authorises the person to be heard without his or her identity appearing in the proceedings, that person shall be given a serial number which shall be entered on the separate file and in the register provided for in the second paragraph of article 706-58.
The record of the hearing of the person and the record provided for in the second paragraph of Article 706-58, which must be placed in the separate file, shall mention the serial number assigned to the person.