Good question,
I don't believe anyone currently has an answer, you might try asking in #help
However, logic states that because some of these codes were found in early copies of the Legendary Edition of Destiny, the codes will continue to work beyond the 9th.
Also, the codes are entered on Bungie.net & linked to your Bnet account so any accounts that you connect to your Bnet account in the future should also receive these rewards!
Redeem codes here: http://www.bungie.net/en/User/coderedemption
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Thanks Dude!