The police have already made dozens of people, including the girls, happy with the discovery of their products. But for some of them a declaration with serial number is missing. Only if the police have a report with a serial number (for example the IMEI number of a smartphone) can the officers see that an object found has indeed been stolen. Serial numbers are often found on an invoice, email, registration and at institutions. If something has been stolen from you, reporting it with the serial number is very important to get your belongings back.