Where is the shady guy on Counterfeit Island?

You encounter him at the end of the Underground Tunnel Tour. He tells you to get the museum job. When you get it, and return after dark, he sends you to protect the famous painting from being stolen. (This does not work out so well.)

Later, you will find a clue to his whereabouts. Get the timecard from the guard at the clown store, and print a photo from the videos. Show his photo to the mimes, who pantomime "musical instruments" as found in the Jazz cafe.