Well couple of things you can do. I have rooted phones before and just restored them to stock and unrooted and it was never an issue. With the new counters that can show if you have rooted or not would be my only worry. If your tripped that and they checked it, that could lead to an issue.
Samsung KNOX Counter you should know | Kingo Android Root
Edit: Also are you claiming insurance or trying to get Verizon to give you a replacement through warranty? With insurance it isn't going to matter but with warranty it will.