I've always thought that doing something naughty and not getting caught would not count as breaking a NAP.

Well, you live and learn.
In this case though, as i'm not "napped" with Midgard, it wouldn't matter. But, i'm not the one to blame for this (or the attacks against Bogarus!). Perhaps there's someone else who has been thinking the way i have or maybe Vargr doesn't have a NAP with everyone?