Even a Kissinger contribution of $150,000 to get the records digitized had to failed to move the process. And while the CIA was at least somewhat responsive, the State Department had declassified, or perhaps "re-declassified," only three of its app. 260,000 documents.
"The pace of declassification of these papers by the (State) Department is maddeningly -- and disproportionately -- slow. I would call it non-existent," he wrote Clinton in Feb. 2012.
...no wonder the families of Korean War POW/MIAs still can't get 60+-year-old files relating to their loved ones released and the Air Force still keeps files classified on the hunt for Hitler.
Apparently Kissinger and his high-power lawyer were finally able to get relief (see bottom), although the final outcome is not clear from the Clinton emails released 12/31/15.