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Just got another call pretending to be my credit union, asking if I had authorized various transactions. They asked me if the FIRST four digits of my card matched. Those are TRIVIAL for an attacker to know. They asked when I had most recently used my card, and where. I said, "you can tell me that." They asked if I wanted my card cancelled or put on hold, and I said cancel. Then they started talking about sending me a new card.
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