I isolated some 'goners' into their own humidity bin (making sure there was adequate moisture in there), then pretty much closed it up and forgot about them. On passing I would open the lid maybe once every 5 or 6 days to fan and close again. I'm pleased to say that I was able to remove a handful of them, when to my surprise, they began to leaf out. So don't just chuck em. Give them one last go round.