(Still confused? Here's a contextual link that will point the Playboy Magazine's location out in our walkthrough. This magazine should be sitting on a table within. Before moving on, however, go into the darkened office directly across the hall from the administrative office.
Seek out the administrative office where the safe keys are being kept, and grab said keys. Head up to the second floor of the federal building once the coast is clear. On his desk, you'll see the Playboy you seek.
Once the guard leaves the desk and goes upstairs, you can sneak up on the lone guard left at the desk to kill him silently. Enter the building and work your way to the main lobby. As you enter the federal building in pursuit of gas stamps, you'll be able to almost immediately grab this Playboy Magazine.
