Perception (EP)

When you first hear that "The House is Listening" (happens near the spiral staircase). Walking further along the first floor, you find yourself in a corridor that turns left, then right. Walk a little along the corridors and on the left you will see a door with two doctor's notes. There is a locked drawer in this office. You can find out the code if you leave the office and go all the way to the left, into the observatory office. There on the third floor (you can go up the spiral staircase) there is a note with the star number - this is the code for the box. Come back, open the box, profit.
The code itself: 2118