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The key card is used later in the game in the Black Widow's lair. Save the key card and return to the museum.
The key card is dropped at the end of the scooter chase. It is used much later in the game.
It will.
you get in the boat and sink
The key card is for later. Return to the museum, where you have a package waiting for you.
on the door inside the hideout
You do nothing for now, you will need it later on in the game. But after you get the key card walk in the museum and there will be a package for you.
After you get the key card, return to the museum for the package there. You will soon have the key to the Inspector's house, and the key card is used sometime later. It opens a guarded room where the Black Widow keeps her stolen art.
You only use the Black Widow key card at the end of the island, to open the sliding doors in her secret hiding place.
The Black Widow key card is dropped by the art thief (shady guy) when he makes his escape by boat.
its on the edge of the dock
When the strange man jumps in the boat he will drop it