Is this the OFFICIAL factory image?

[feelinfroggy23]

I rooted my nexus 7 using the stickie on this forum. Worked great. Now that i have to return my nexus 7 for the 4th time due to a bad speaker, I need to unroot it. I used the one click toolkit to unroot and it worked good. My only question is the factory image used. Is it the OFFICIAL factory image or is google going to know its not and charge me? Heres where i got the factory image.
https://developers.google.com/android/nexus/images
I believe it nakasi's download. But if you know please tell me

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[ragnarokx]

You got it. Doesn't get any more official than from a Google.com address

Sent from my Nexus 7