You have to swap the painting out to get the museum job. (Move each wrong painting clockwise into the next wing.) Then you take the Forgery Training to get a Supply Room key.
(see related question)
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after you get a job at the museum
under the palm tree hope you complete it!
you get them when you get a job there. Talk to the assistant curator
You have to get a job at the museum after you take the underground tour
go to the guy near the door. talk to him.
You have to re do it. It is not that bad.
Put the pictures in the right category.
Counterfeit IslandNo, Counterfeit Island is real. In fact, it'd be better named as "Art Island".
Yes. See the related question below.
talk to the BLACK guy in front of the coffee shop
You do not die on Counterfeit Island.