ID Card #81 is a collectible item in Dead Island. It is part of the My collectibles, let me show you them! challenge, and the Gotta find'em all and Nearly there achievements. It can be found in the Laboratory map of Act III.
It's on a table in the second building of the quest The Dead Don't Eat Crackers. The one in front of the questgiver, Sebastian.
Can be seen on the following map:
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