And none of them misinterpreted a knocking sound. Krauss, Natsuhi, and Genji were not involved with the knock. No one else existed inside the mansion And that knock refers to the action of standing directly in front of a door and hitting it with a hand.
Hmm... I don't like this idea, but lets check if it works
The only requirement for the knock to be heard is that someone stand in front of the door and use their hand to make a knocking sound. Someone in the Dining hall, let's say it's Kyrie, stood in front of the door from inside the room and made a knocking sound that people heard. Kyrie then took a letter from her pocket and made it look like she picked up the letter from a crack in the door. With this the letter was never delivered to them from outside the room it was in someone's possession in the Dining hall the entire time.
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