Warehouse Key

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

History
The Warehouse Key can only be obtained during the "Penguin Murder Mystery" case in Shiver City. The Warehouse Key is found at the bottom of the frozen lake and Mario must Spin Jump the lake three times to break it. Then, Mario must ride on Sushie and dive underwater to obtain the Warehouse Key. Mario can then use the Warehouse Key to unlock the nearby warehouse which eventually leads to Herringway's secret room.

Trivia

 * If Mario attempts to break the icy lake to get the Warehouse Key before starting the "Penguin Murder Mystery" case, the Penguin Police Chief will kick him back to the main area and the frozen lake will be fixed.
 * The Warehouse Key shares its sprite with the Odd Key, the Prison Key, and the Storeroom Key.