This section offers a summary of the evidence for "The Victim", a flashback seen in Get Even, and tips on how to get access to the flashback room and its contents.
The evidence board for "The Victim" is shown on the screenshot above. The task is characteristic for its numerous evidence. Nevertheless, most of these are documents, photos, or newspaper clips, but you'll also need to scan a number of interactive objects. Make sure you've visited every interactive area before the warehouse (the locations marked by squares which are revealed after approaching them).
In our case, the gate was unlocked by inputting 7319, but as the game randomizes this type of data, you may receive a different combination. Warning - Avoid inputting the combination without going through with the mission, as the gate will stay locked.
The hidden room can be found in the further part of the level, beyond the area where you've watched the vision that depicted the visit to the murder scene of one Jasper Prado. You'll once again appear in an empty hall with pillars and blood trails (visible after applying UV light) that lead to the door shown on the screenshot above.
Proceed forward and watch a new cut-scene (screenshot 1). Continue by making your way through small stairs in a dark corridor. The staircase leads to a locked gate from screenshot two which contains a panel that can be used to input the code.
The secret room contains a case with an assault rifle that will be added to your arsenal (you can use the weapon in the following missions by choosing it inside Black's mind) and a TV that replays a conversation between two policemen when interacted.