I don't think the majority of the public is aware of the extremely devious stuff the FBI has done w.r.t. civil rights leaders etc.

Even if nothing substantively new is released it gives him a chance to rant about the FBI as part of his mission to seize power and discredit the "deep state" while cosplaying as a supporter of truth, justice, people of color, etc.

does the FBI have anything memorializing Ernest Hemmingway as well? That'd certainly be ironic.