Terry,
If you look up N217CB on the FAA you will note that there is a pending number change to N227SL. I caught N227SL on the network and made the change. The owner is authorised to make the change and the FAA does not make the change to their database until the owner notifies them it is done. This notification can sometimes take a good deal of time after it has been done, quite archaic to say the least. and the aircraft can be flying around under its new guise for weeks, months before the change is notified and the database updated
Alan