Me too, and I'm seeing a whole lot of other people with the same bug on twitter. Apparently AppleCare are saying codes will be reissued, so report the problem:

Me too, and I'm seeing a whole lot of other people with the same bug on twitter. Apparently AppleCare are saying codes will be reissued, so report the problem: http://www.macrumors.com/2012/07/25/apple-reissuing-os-x-mountain-lion-up-to-date-codes/ http://www.macrumors.com/2012/07/25/apple-reissuing-os-x-mou... edited to add: I've now had a response from apple after mailing support. We're getting new codes. NB they do mention doing this in response to a claim, so it appears you did need to contact Apple if you had a problem! "Before I proceed I would like to point out that Apple is aware of the issue and are working hard to resolve it ASAP...If your claim is accepted, a valid replacement code will be sent to you by email. There will be no need to submit a new claim....Please let me know if you do not receive a replacement code within 24-48 hours, as I'll be happy to look into things further for you."