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This check is up the ladder on the side of the room you'd come in from in the base game.

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From the previous, you can see both of these checks opposite.

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This check is in the security office overlooking the main room with the previous checks.

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These two checks are in the machine room, accessible through the side door down the hallway where the Mosin-Nagant is in the base game.

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This check is on the lower level of the room adjacent to the machine room.

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And this one is on the upper level on the balcony overlooking the same room.