My suggestion is that you mind your own business unless you are head of the neighborhood watch. The guy has complied with the law and it's that simple.
I've had nosey ass neighbors talk about shit that is nobody else's business.
On another note...And I have not read this entire thread...But...How do you know he hasn't told the new people? If somebody asked them "Hey, has Bob told you that he is a convicted sex offender?" then somebody has obviously told them anyway which means they are aware and once again, you should mind your own business.
