What is puzzling to me about this is that nothing updates that fast. Not property records, credit reports or anything I can think of. To have figured out your new address within 30 days of your move is baffling.
The only theory I can come up with is that you ordered something online with that card and listed your new address as the billing address with the online merchant. When the charge was submitted, CapOne used the online order as implicit consent to a billing address change.
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