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Costco sells Alaska salmon, at least here. There are laws that require place-of-origin labeling. If anyone's switching labels or mislabeling salmon, they're breaking the law. Also, many Alaska fishing organizations use their own distinctive regional labeling. Examples are Copper River, Aleutia, Kenai Wild. They know where their fish is being sold and where it's not being sold, in case anyone's counterfeiting. (You're right that it does happen -- there was a recently big New York Times expose on how several grocers and restaurants were falsely labeling farmed salmon as wild.)