There are two problems.
First, the evidence Grusch says he has is hearsay - that is, he heard it from someone else, he hasn't actually seen anything first hand.
Secondly, nobody knows what has been handed over to whom, or even if it has at all - so it's complete conjecture and guesswork on the part of everybody else.
On the question of, am I expecting to be shown this evidence, I suppose I am yes.
I'm expecting to see it, because the claims he's made to Newsnation, Ross Coultard, Leslie Kean, Ralph Blumenthal, have been made in public via the media. For him to now retreat behind some shady government veil, and not reveal anything - to me is disingenuous.
It's disingenuous and problematic, because it looks like he's doing it to gain attention - why try to push the govenment under the bus with the claims, (some of which are quite serious, people being killed etc) then retreat behind closed doors with the real facts, after running his mouth off all over the place.