That depends on a variety of factors. First off is whether or not there's a root counter. Secondly is whether or not the phone can turn on. Thirdly, and somewhat probably, is whether the factory images and any sort of "evidence" has been gone.
I've had 4 CLN replacements of the Galaxy Nexus. You know how many times they "knew" I was rooted?
0.
Well, there you have it.
I think we wore out this discussion. All the best to you.
