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They are sometimes on the corpse of a feral ghoul. They serve no use in the game, just like the red pass card. They say they were used in the metro station instead of a metro ticket, kind of like a yearly bus pass, instead of buying a ticket each time you use the metro. People also say it makes refrence to Doom as they had Pass card keys, but I doubt that because the game only has red, and blue cards, versus Doom had red, blue, green, and yellow.

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