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It's literally got Operation Chaos written on it so you can't miss it. Sneak over to where he's being held inside a warehouse, dispose of the guards, and you'll find an audio reel lying on the table.
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Numbers Station Broadcast: During the Brick in the Wall mission, there's an option to free an informant that helped get you information about the Soviet spies.Interrogate him and get him to tell you more about Arash, and you'll get this piece of evidence.
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