There are no keys on Back Lot island.
If your talking about Counterfeit Island then you get the key and go back to the museum on Counterfeit Island
Back Lot Island (April 2013)
yes
The 35th island (August 2013) will be Virus Hunter Island.
There is no key to MacGuffin's or its back room. The key that you do recover fits the back room at Good Deals next door.
Once the player locates all of the scripts from the Back Lot Island on the game Poptopica, the scripts must be properly rearranged in a specific order.
Back to Stage 2, to give them to Sofia.
It is to the far right on Sunrise Street.
To beat Back Lot Island in Poptropica, you will need to first talk to the homeless man. Tell him you have not heard of him, then talk to the woman at the next in the next shop to the left.
There is no key to the dungeon. The small key open Mordred's underground laboratory, which has a back way into the dungeon. (see the related questions)
Ask the owner at the Talent Agency.
you take it and bring it back to spy island and give it to the spy in the trash.