Forgotten Closet is a fan made location. This is the starting location for The Lost Mouse.
It looks heavly damaged with pieces of the roof collapsed here. The cups are on the ground being shattered. Underneath a pile of wood is The Lost Mouse's sharp hand laying on the ground still connected to him. One of the shelfs has collapsed and the light is damaged.
The Lost Mouse can be seen here under a pile of wood. He goes through 3 positions.
The Lost Mouse's Positions
1st position: under the pile of wood.
2nd position: getting up from the wood.
3rd position: floating near the exit (which is on screen).