This depends, sometimes they have and at other times they haven't - even with their cadetship it was the same.
There is a reluctance to send 'no' emails out, this seems to be because they rarely have a definitive 'no' on all people, there are times when they have actually sent out negative emails and then called the person back without them even reapplying. They seem to like to keep all their options open and for this reason don't like sending hard negative emails ... remember they can only take a certain number at a certain time, they may still really like some people and want them as an option in future.
This is what I have been told directly from those in the know and also from my own personal experience.