The small key is a key attached to a green felt cat key chain. It's used to open the closet leading to nursery room.
Game[]
After mysteriously receiving a photograph of three hanged students, which she obtains by taking a picture of the oddly placed rust, she spots a key hidden in one of the desks in the room with the collapsed walls. She later finds the key and uses it to open the closet door.
Trivia[]
- Most likely belonged to Scissor Phantom (Principal), as he was the one who kept using the nursery room to keep his fictitious baby.