I certainly would never tell someone to break the law.
I would tell people to excercise common sense and good judgement.
Odds are if you have a pair of nunchaku, keep them in your gym bag AND ONLY TAKE THEM OUT IN THE PRIVACY OF YOUR HOME OR DOJO, and don't try to show off in the yard for the kids on the street... You probably will not have a problem.
I have trained in many areas where nunchaku and assorted edged weapons that have training/historical value are not permitted by law. I have also trained with police officers and lawyers(barristers??) in these areas, with these weapons.
There are too many murders, drunk drivers, burgulars, etc. that tax law enforcement for them to be worried about an antiquated Okinawan weapon used only for training/historical purposes. As long as you are not waiving them around like a Jack A$$ for your friends or irresponsibly leave them in plain view on the front seat of your car.
Once again this is just my point of view, but then again I have been known to ruthlessly tear the tags off of mattresses with total disregard for public and personal safety