You never do. It is not a game item, just a distraction.
There is no key to the chest and no way to open it. It is just a distraction.
(The actual item in the house is the gaudy painting on the second floor.)
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)
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.
The curator of the Museum Fantastique summons you to Early Poptropica and gives you a key, which fits the cottage door.
you dont. go on the shelves beside it and climb. at the top there's an entrance to the vault.
I forget but I think the lady in the museum gives the key to you...
The art museum on counterfeit island opens after you go to the guy at the dock.
After you are in the Widow's lair, you can use it to open the final door to her trove of stolen art.
You get the Key Card after the scooter chase. You cannot use it until much later. Return to the museum to receive a package. In the Black Widow's lair, the guards are patrolling, but you can reach the locked door to her treasure vault (use the key card to open it).
you have to find the door that goes with it,( is the key to open the janitors closet that will help you in a time that you need it.)
What kind of sliding door?,,,,, Vehicle? House? Bank Vault?
The key card will open the door in the Black Widow's lair, once you get past the guards. (see related question)