Find Casey's Key is a Quest given to Mickey by Casey, the Mean Street Emporium owner. Apparently, Casey lost the key to his basem*nt and will give Mickey a Power Spark if he finds it. To find the key, Mickey has to go to the little street between the Ice Cream Parlor and the back part of the Emporium, thin the sewer and fall down to get the key.
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the key you have to find