If you mean the small notebook hanging on the wall in the street, it is the patrol record, and the policeman in charge of patrol should sign down the time when he passes by.

If the police take more records from themselves, you should remember the important things every day before you go. For example, pay attention to the model and license plate number of the lost car, check whether there are any cases in the area, and if there are, record the information and feed it back to the police station.