Key to Bowser's Castle
From the Super Mario Wiki, the Mario encyclopedia
The Key to Bowser's Castle is a special item in Paper Mario: The Origami King. It is one of the many keys Luigi finds on his quest for the Key to Peach's Castle, and is used to unlock a door in Bowser's Castle. Bowser's emblem is displayed on the key. Mario must enter Kamek's room, where Luigi is found huddled and mumbling in the corner. This is revealed to him simply having found a Shiny Mushroom. He claims to have also found the key to Peach's Castle and gives it to Mario, which of course is the key to Bowser's Castle. Luigi comments that it was strange to find it in Bowser's Castle before Mario explains it is another wrong key. Upon hearing this, Luigi apologizes, but decides he is getting very close, having at least found the key to a castle. He then sets out to find the real key, allowing Mario to use this key to enter the throne room.
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