What was the email address that wallets from the pre-sale were sent from? This is the email that would contain the ethereum_wallet_backup.json file.
Just found the answer in the comments of another post:
It will be an email from
confirmation@sale.ethereum.org
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You should probably mark this as the correct answer (click the little green check mark) so that others know that they can find the answer here. – Tjaden Hess♦ May 7 '16 at 23:02
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