No doubt, using an eDiscovery tool similar to something like Ringtail will get you results in a couple days, probably even less.
You would run the whole set of emails through to find out how many were duplicates to what you already have. Then you do finer analysis around specific keywords or phrases that you’re looking for, and then probably have humans look at anything that’s been flagged from that. This happens every day in the legal field, and there’s tons of software products out there that do this.
It’s predicated on the search terms selected. You can’t find what you don’t look for.
It was realized last summer, Comey and his agency reek like a week old homicide scene. Corrupt to the core, from top to bottom.