On 17 Greendale Street, Tony Owens owned a brass music store. Next to him, there was another music shop owned by Jeff Ringlington. One day, two kids named Jerry and Spencer went into one music shop and then the other looking for an instrument. A couple of days later, an instrument went missing. The police were put on the case. The next day they found a clarinet in the deserted alley on Juleps Avenue. Both music store owners immediately told the police that it was their instrument. The chief of police told the officers to give it to Jeff Ringlington. What made the chief so sure it belonged to Jeff?