How to find a mainlander missing in Hong Kong?

You can’t find it yourself! The Mainland Public Security Bureau will first write an application to the Hong Kong Immigration Department. The reply letter from the Hong Kong Immigration Department will state which port the person entered the country at at what time on which day. Where is the place of residence? Then search for this person through the Hong Kong Police Force~ The police will use internal or public networks to find this person, and the radio and television networks will publish the missing person information. If the person enters the country illegally, the police from the other side can only use public media to find the person. Because there is no entry and exit record ~ ??there is no file of this person on the computer