Sniper Elite: Resistance

During Mission 2 'Dead Drop', a blue optional objective marker on your map will take you to the Grand Library, where you'll need to pick up sensitive files pertaining to Resistance members. There are three in total in fairly obvious places (desks, tables etc.) in the library, and they look like regular files. They are Police Report: #222, #223, and #224, if you're interested, and also count towards the mission's collectibles tally.