There is no verification, online or otherwise, for that kind of thing. A future firmware could -possibly- do this, but since we will have emuNAND, the check could be completely patched out or just send modified responses. So this isn't really something to worry about, no. If they don't do it on N3DS which has better security, they won't do it on WiiU.
If Nintendo do it correctly you wouldn't even know there was a check being done at all, let alone know how to send the correct response.
Fortunately they don't seem to care, and often make mistakes.