ID Card #56 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 the floor of the cell where Bill's corpse is found in the Police Station. Near the security room.
Can be seen on the following map:
ID Card 56, Location (not available)
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