A Massachusetts radiology lab has lost a portable hard drive believed to contain personal information and x-ray images of 9,387 patients, the MetroWest Daily News reports.

The practice mailed letters [on Jan. 8] to the patients whose medical records are missing. The hard drive stored names, dates of birth, patient identification numbers and bone density scan images dating back to 2010.

“There are no leads on where the hard drive went,” Brian Parillo, the executive director, said in an interview Monday. “We’ve looked everywhere in the building, spoken to every person who works there and nobody knows.”