I never got notification about the redeposit. It was done manually over the phone so I am not sure you would get one if the reservation was canceled online and the cert redeposited manually. I now have two certs stuck in reservations that I no longer need, but I have been unable to "detach" the certs. It appears I will need to call to cancel and get them redeposited. Hope this helps.
LAX
Thanks it does help and make me think that I am missing a FNA then. I will have to ask the Bonvoy Lurkers for help.