“Duplicates” are just their excuse for removing anything that is incriminating.
Based on that, I’d imagine they’ll end up claiming that they had every email in triplicate.
The court should demand the emails as they are. Its not that many really. Judicial Watch would be happy to have a small team of people sort them out in a day or two.
You’re absolutely right — this is just a delaying tactic so that the agency can “sanitize” the emails.