The four animatronics from Freddy’s were put in an abandoned warehouse, to be used for parts and left to rot. You have 3 things in your inventory: Flashlight, Freddy Mask, and a maintenance panel. These things are very important. The Freddy mask will not work for Foxy, use the flashlight for Foxy and the mask for the other 3 animatronics. The Maintenance panel is where you can wind up the ventilation and music box, which are both crucially important or you will die if you don't wind them. 