According to data releases by the ITRC, at least 27 percent of the data breaches in 2009 were from paper being documents being stolen or found in the trash. This was based on publicly disclosed breaches. That puts the number of breaches by paper at 125. It is impossible to say how many people were affected. [full article]
While it is the lost/stolen disks that get all the press there is still a real threat from paper documents. Most computers require passwords but the storage area is wide open for any employee.