Sorry, but don't think there is anything you can do to erase/reset the, far a lack of a better word, "mechanism", that keeps track of the phone ever being rooted or is currently rooted. Let me elaborate...your phone has a unique identifier. Verizon has the capability to query your phone to determine its "state". One aspect of that is whether the phone is rooted, has been rooted but not rooted now or has never been rooted. That information is stored in Verizon's system, not necessarily on your phone. So trying to reset that or change that information is like trying to "un-ring a bell".