Adam, when a registry card/set is sold it will stay in the registry until the new owner tries to enter the card and then they will get a notice that the card is in another set and do you wish to send them an email to remove it. PSA/SGC gives them a couple days and then they will remove it for you, a few times they have asked for front and back scans to make sure you own the card.
The down side of this is when a graded card/set is sold to someone who is not a registry collector the cards can stay in the old set, I follow one exhibit set that a bunch have been sold and yet the set still shows them in it 1 year after they were sold.
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