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Directly behind the truck, right next to the main building.

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This check is right next to the truck spawn, just up the stairs.

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Directly inside the main building from the last check. In MPO+, this wall is broken, and just behind that is the location.

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This is where the secret document is in the main game. The exit marker will be in the middle of the raised platform.

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Second floor of the smaller building, in the control room.

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The location here is just behind where the truck will be in the main game.