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The reason RIAA hasn't certified it yet is because most retailers have an opt out clause with their purchases; meaning that if the stock just sits on the shelves, they have a certain period of time to return them. Once that time frame passes, the retailers are stuck with the merchandise, and it's technically sold. I don't see Katharine's CD sitting on the shelves, but the RIAA usually waits for this time period to pass before certifying a release as either GOLD or PLATINUM.