I never found my Kickstarter backer number either. I don't recall ever seeing it in an email from OUYA.
I wonder why they asked you for the Kickstarter backer number? If they knew where to send the email, they should already have the delivery details from the earlier survey.
As a kickstarter backer you could choose your username ahead of time.This was done towards the end of last year. You eventually got an email (mine came 2012-12-15) from Team Ouya with the title "Confirm that you are username" (in my case dr-nix obviously). There you confirmed your email adress and set a password for your account.
At the end of that email they said PS! your kickstarter backer number is x
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And they wont reply to you very quickly, they have alot on their hands! :)
I made the OUYA exclusive games Cube and Creature and Hellworm!
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