Returning an unrooted phone to Verizon?

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http://androidforums.com – So I am getting an upgrade in about two months (Galaxy SIV, drooling already ;)) from my HTC Thunderbolt. I had rooted this a while ago with Revolutionary, and I have now successfully unrooted it with full S-ON, etc. My question is basically whether or not Verizon can tell (or if they care considering it is completely stock *technically*) whether or not it was rooted. What concerns me is that I am running Froyo 2.2.1 on it now, a horribly outdated software. However, when I try to update it, it insists that there are no new updates. I think this might have something to do with the fact that w (General)