How to Retrieve Keycards and Infiltrate Bank Vault Without Detection

Blue keycard is on back of guard's belt patrolling 2nd floor. Wait at stairwell entrance and take it when he passes. Disables security cameras.
Red keycard is on 1st floor guard patrolling restricted area. Take from his belt while his back is turned. Disables vault alarm.
Access 2nd floor and stairwell by picking lock on gate left of bank. Go up fire escape.
Scan blue keycard at door by stairwell to disable cameras.
Scan red keycard at door on other roof side to disable vault alarm before opening.

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