its on the edge of the dock
When he leaves he will leave it on the docks
The Black Widow key card is dropped by the art thief (shady guy) when he makes his escape by boat.
It will.
you get in the boat and sink
In the clown store
if you want keycard then go to poptropicahelp.net and do island guide
There is nothing to do with the key card immediately. Go back to the museum to find a package waiting for you. You will be leaving Counterfeit Island (temporarily) to travel to another island, for some valuable information.
The key card is for later. Return to the museum, where you have a package waiting for you.
When the strange man jumps in the boat he will drop it
you go to the art musem
Go to the Clown store and get the time card from the museum guard. with that, you can narrow the time to see the theft on the museum's Security Room videos. Get a photo of the thief (it's the shady guy) and show it Downtown.
It is for the scanner at the top on the inspectors office on the inside.