Storeroom Key

The Storeroom Key is a key item that appears in Paper Mario.

History
The Storeroom Key was taken from Harry by the Shy Guys during the events of Chapter 4. Mario must head into Shy Guy's Toy Box to find the Storeroom Key inside of a chest. After doing so, Mario can give by the Storeroom Key to Harry who unlocks the way into the storeroom of his shop. Mario can then take the Toy Train that is stored in there to travel further in Shy Guy's Toy Box.

Trivia

 * The Storeroom Key shares it's sprite with the Odd Key, the Prison Key, and the Warehouse Key.
 * Mario has the choice to either give the Storeroom Key to Harry or to unlock the storeroom himself. If the latter is chosen, Harry will be a little upset by this.