I got one a few months ago. I called a number of Neiman Marcus Chanel boutiques and got myself on about 10 waiting lists for the classic black caviar ghw WOC. I received a text that one was available about three weeks after calling. After that, I received a couple more texts over the next month or two from different boutiques, because I was still on their waiting lists. (I called more than 10 boutiques but only put myself on the shorter waitlists)
I think I was successful in part because of my determination and effort and also my timing....the wocs were being sent to the boutiques soon after I called. I must say that calling NM Chanel boutiques was a better approach than going into to my local Chanel boutique to get on a waitlist. I never heard back from the latter!
good luck!