To get past the Black Widow's guards, go along the bottom and climb up behind the one on the second floor. When the female guard walks over on the third floor (up and to your right), jump up and secretly follow her, until you can jump to the springy chair and bounce up and left to the card scanner. You open it with the spider key card.
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In the clown store
you sneak along the first level and jump behind the guard on the far right. wait till the woman guard reaches the end and turns around. sneak up behind her and jump on the couch to get to the key scanner. the key card is on the dock. the Guy drops it after you chase him
The key card is dropped at the end of the scooter chase. It is used much later in the game.
The Black Widow key card is dropped by the art thief (shady guy) when he makes his escape by boat.
The red card dropped by the Black Widow is a key card that opens the vault in her underground lair. If you return to the museum after picking up the card, you will receive a package that takes you to another island, to enable you to find the missing painting.