Most of the bicycles I've seen at police impound are cruiser bikes and other assorted hybrids that aren't worth more than their scrap metal value (no wonder they sell them in /lots' containing multiple bicycles). If the police had a high-value bicycle it would probably be a newer model from a burglary arrest/seizure and they could find the serial number in the California database (the State collects the serial numbers of newly sold bicycles from dealers).