It appears as if someone did something Very Bad yesterday. It is Just Not Right for someone to sit on screens on a training version of a job from the wrong month. It is more wrong that they were not caught at the time, though since I have a twisty little mind that can twist in the exact same way hers does, I know exactly how she did it now that I know that she did it. Question suggested to Pink Shirt Guy's Counterpart to ask about the girl: "How was her production?"
In other supplementary news, the problem of the roof and/or attic seems to have been one of noise. My instincts saying it needed discussion with Management were dead-on, unfortunately.