Has my iPhone Been Unjailbroken?

I bought an iPhone less than a year ago and foolishly, the day after I jailbroke it, not really knowing what I was doing. The only stuff I downloaded with Cydia was MewSeek, which I only used twice, and then it was all forgotten about.
My power button has now been jammed or stuck and as it's still under warranty I plan to bring it back. I've restored my iPhone so all the Cydia stuff have been deleted, so will I be ok? Or will they still know?

If you restored it, they can't see or find out.

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