ID Card #55 is a collectible item in Dead Island, and can be found in the Police Station Map of Act II. It is part of the My collectibles, let me show you them! challenge, and the Gotta find'em all and Nearly there achievements.
It's on a desk in a room after encountering the first punks in the Police Station. You will see a big police logo on the ground before entering the room.
Can be seen on the following map:
ID Card 55, Location (not available)
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