Elections Ontario isn't exactly clear what's on the drives, or whether the drives were stolen or are merely missing.

Essena told reporters the two drives have names, addresses, gender, birth dates and "any other personal information updates provided to Elections Ontario" by roughly half of people on the voters list last fall, and possibly, whether they voted. What's not on the drives are social insurance numbers, health card numbers, drivers licence information, credit card or banking information.

But after several months of investigating it still isn't sure what names were on the drives. It believes they covered 20 to 25 of the 49 electoral districts being worked on by staff at the time.

Even forensic experts hired by the department can't figure out which ridings were on the drives.

The department has done a "rigorous" search for the drive, Essensa said, and a full investigation by a private law firm and a forensics security firm, an investigation still ongoing. It's also been reported to the Ontario Provincial Police.