ok, compiled my take on the placeholders. I'm not infallible, so mistakes could have been made :) Also for OTR_C_], it could be On The Record_Comey, but the open bracket leaves me unsure, so leaving it as so for now.
Coud be. Could also be all the On The Record transcripts from the cooperators. Q gave us the list of everyone giving testimony to Huber. Makes sense to follow it up with everything in their testimony