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I remember reading a story here about (New York's) subway system and a copied master-key that got around. Can't find it here, but If found this: [0] [0] https:

• csnover 6y ago
  That does actually make more sense, given the OP’s comment about master keys leaking. I remembered the CharlieCard thing because it was a pretty big deal at the time, and I couldn’t find anything relevant about MTA when I searched, so assumed it was a misremembering since this all happened over a decade ago. Thanks for the link! (I wonder what the outcome was of New York’s audit…)