Boxes of medical records for more than 1,400 patients of Jackson Health System have been missing since January, the hospital system reported Friday, after mailing letters to affected patients informing them of the privacy breach and offering free credit protection services — even though Jackson administrators say Social Security numbers, credit card numbers and financial statements were not contained in the documents. Matthew Pinzur, a Jackson spokesman, said the boxes of records went missing from the Health Information Management department, which handles all patient medical records, and that the missing documents were either on their way to be scanned electronically or returning from the process.