Got Replacement Phone; Reset stock before sending back?

[obidon]

So I dropped my Inc I couple weeks ago face down on some cement tiles and the screen turned into a spider web. Luckily I still had my two year warranty so I ordered a replacement phone.
The new Inc just came in so I'm about to send the old one back but before I do I have one question.

Should I completely restore the old phone and un-root before sending it back?

The last thing I would want is to send the phone away and then have them not give me back the $300 deposit because they found out it was rooted before and therefore my "warranty was voided".

Thanks for the responses and suggestions

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