Bonus Objective 2 - 3 pieces of Evidence

Evidence Piece 1: After ruining the officers' meeting, return to the main hallway and enter the main ballroom. Turn right upon entering the ballroom and go through the open doorway into the hallway leading to the kitchen. Clear the soldiers and cook in the kitchen, then find Evidence Piece 1 on a table to your left.

Evidence Piece 2: Exit the kitchen and enter the room with the save point. Go upstairs and into the room where Bromley is fighting enemies. Turn left, stay behind the red bar, and find Evidence Piece 2 on top of the bar near the end.

Evidence Piece 3: Exit the room with the red bar and head down the hallway. At a junction, go through the right doorway, then turn left around a bed. Evidence Piece 3 is located on the footrest beside the bed.