The Supply Room
You get the key from the assistant curator when you complete Forgery Training.
The Inspector's House
You get the key from the curator after the scooter chase. (You will get a package at the museum and travel to Early Poptropica island.)
The key card will open the door in the Black Widow's lair, once you get past the guards. (see related question)
You don't, because there is no key. The chest is just a distraction.
You don't. Later in the game, you will receive a key to open the door of the cottage.
First, you have to find all the pieces of paper around counterfeit island. When the pictures are assembled together, it will show a picture of a dragon. Make sure the dragon on the door is the same as the dragon in the picture.
There is no "vault" on Counterfeit Island.The Dragon Face LockAt night, secretly enter the museum by opening the Dragon Face lock in the Underground.The Black Widow's LairThe Key Card you recovered from the scooter chase will open the locked barrier.(see the two related questions)
The curator of the Museum Fantastique summons you to Early Poptropica and gives you a key, which fits the cottage door.
I forget but I think the lady in the museum gives the key to you...
You can open a locked door (From the outside: With a key)(From the inside: With the lock opener, usually by twisting it) :-)
After you are in the Widow's lair, you can use it to open the final door to her trove of stolen art.
The art museum on counterfeit island opens after you go to the guy at the dock.
To get past the guards, go all the way to the left, climb above the boxes to avoid the male guard, and when you see the (female) guard on the third level, follow her and bounce up on the sofa to the locked door. (Use the key card to open the door)
To get past the guards, go all the way to the left, climb above the boxes to avoid the male guard, and when you see the (female) guard on the third level, follow her and bounce up on the sofa to the locked door. (Use the key card to open the door)