you can't.
There is no key to the chest.
the chest is just a distraction
you use the key
You don't, because there is no key. The chest is just a distraction.
You get the key from the person next to the lab
You don't open it. It was there just to get you to try.
You don't open it. It was there just to get you to try.
There are no beakers on Counterfeit in Poptropica.
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.)
You can't open the chest in the Black Widow's House
The art thief is back on Counterfeit Island. As part of Counterfeit island, you don't need to do anything in Early Poptropica except get the key from the curator at the Pop Art Museum, then return to Counterfeit Island to open the Inspector's house.
she is in the library