What I would question is how they would be separated out by a hacker from the ones that she did turn over. Apparently she deleted about half from her server and turned the rest over. One would think if a hacker got them, he would have a copy of the whole chunk, from before she deleted any, so it would be more than 33,000.
The rumor on 4chan is that Clinton’s people had at a least one duplicate server (some are saying two, one designated Hillary and one designated Cheryl Mills) that they uploaded the 33000 emails to. Then they deleted those emails from the server in the bathroom. Hackers found the duplicate servers and took the 33000 emails.