My father moved and HAD been privately reproved and the elders did nothing....I called the COBOE in his new congregation and he knew nothing about it and was upset, he had 4 young children. So Legal can still decide not to notify the new BOE. No matter what, only the elders can protect their own children, but no one else in that congregation will be notified officially.
The sisters in the congregation have no chance of knowing these things unless an elder chooses to warn them that there is a need to protect their children. Very worrying indeed.