Will it still be redeemable even after it's left the Shop then?

Will it still be redeemable even after it's left the Shop then?
As they were accidental releases, I'm assuming they were in the catalogue for a much shorter time than the platinum bar, so I doubt the platinum bar will rise as quickly as they did. However, as it can be redeemed for 500c (I'm assuming it can) it should always be worth at least 500c, so it's a safe investment for those who bought it from the catalogue.
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