After checking the lights and making sure there are no electronics, you must check the Pirate Bay. This is where the fox should be. Ideally, you should keep the curtains closed. If you see Foxy in the camera or the curtain is closed, you're fine. This is what you want. If the fox moves away from his curtain, you can hear a loud crash, and you don't want to quickly get away from the camera and close the door on the left. This is extremely important. You hear a few loud metal bangs on the door, and then it's quiet. When it's quiet, check the lights and open the door (unless Bonnie is there). Fox should go back to the Pirate Bay. You can go about your business as usual now.