on the first island
The assistant curator is on the top floor. The actual curator is on Early Poptropica Island in the pop art museum.
you get them when you get a job there. Talk to the assistant curator
At the art museum in Early Poptropica.
The "assistant curator" will offer you a job if you correct the hanging artwork (move them clockwise to the correct galleries). After you get the key from the curator on Early Poptropica, return to Counterfeit Island and use it to open the Inspector's House.
the curator isn't on counterfeit island... shes in early poptropica...
The assistant curator of the Museum Fantastique will give you your job test and Forgery Training. The curator is off on Early Poptropica island, and you will visit her there after the scooter chase.
You get it when you pass the Forgery Detection training with the assistant curator.
you go back on counterfeit island
Well, First talk to the assistant curator in the museum. Then, he will give you a message from the curator telling you to go to the Pop Museum in Early Poptropica Island. The curator (Old lady in purple) will give you the key to get in the inspector's house back on Counterfeit. ;D
On Early Poptropica. You deal with her assistant curator until after the Scooter Chase, where you get a message to meet her on the other island. Go there by blimp and meet her in the Pop Art Museum.
The assistant curator will give you a painting with a message saying someone wants to meet you at the museum. Its the curator gives you the key to the house in the countryside.
Pass the assistant curator's test on painting styles. (see related question)