From the Super Mario Wiki
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There is a bathtub, sink, and toilet in the 505 Bathroom. There are coins scattered around the floor. There are also two coins in the sink. If Luigi opens the toilet lid, a Mouse will pop out. There is a suitcase in the bathtub. If Luigi turns the faucet all the way, the tub will overflow and the suitcase will pop out. He can then use the Suction Shot on the suitcase to destroy it and reveal a Pearl.