>So the Q post to comms is genuine?
Yes, of course. That board is restricted from posting by anyone other than Q. Try it yourself.
Also Q uses the same tripcode on both boards.
It's absolutely genuine.
>Haven't been able to ferret it out properly…
Why not? Just follow the link (or open in new tab) from the Q post list in OP. See for yourself. Try to post on that board or respond to any post there.