From what I have read, some of the records the FBI were looking for pertained to the FBI’s role in Russiagate, records that were just subpoenaed by Judicial Watch last week. I think it’s plausible that the FBI wants to know what records Trump has so that they can release the bare minimum number (if they don’t know what he has, they run the danger of not releasing records that are known to exist) and tailor their narrative based on just those documents. So this may be a “protect us” as much as it is a “get Trump!”
I’ve been to Judicial Watch and sat with them for hours. The first thing that becomes apparent is that “everything is negotiated”. I went to them about reporting some illegal server at the State Department only to be told they could only “officially” work on that server from 2015 forward. By 2015? The worst part is that they told me that “had it all” going back before Obama’s presidency and they could not do anything because they negotiated what they could work on. Nothing is beyond Government corruption - JW is no more than another Official Government Sanctioned Gatekeeper.