Patients who had X-rays at Raleigh Orthopaedic Clinic before 2008 are being urged to keep an eye on their bank statements and credit reports after 17,300 sets of X-rays vanished.  A company the practice hired in January to convert X-ray films to electronic files never returned the materials, according to a letter sent to clinic patients. Instead, the X-rays are thought to have been resold for the value of the silver they contain, said Constance Scott, the clinic’s security officer.;