In editing your character in the arcade mode, theres the alfredo mask, if you didn't buy it, go to maries shop.
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if they are white and blue, That Would Be for Bonfie's Arcade machine, but if you don't have her unlocked already, Buy the Screwdriver from maries shop, it will be on the table in the staff only room/storage on the table, then go into the vent in your office, keep going right until you reach the arcade, then on the next work of night, she should be unlocked and will add to the challenge if you don't have her unlocked already