Start by asking for a list. An inventory of emails. I was listening to a journalist talk about trying to get documents out of the federal government, and she suggested that the first step to take us to ask for a list. List of emails, list of meetings, and then start picking it apart from there. I guess go small and then grow.
Unfortunately, it probably won't work in this case, because the Adams administration will just ignore you, knowing you won't or can't sue.