I just did all 9 skull quest, some with troopers, and all 9 counted. This is great, as I had often problems with this type of events! Hope it will also work the next days.
I am not keen on mimic, have 4 sets and don't use them. Greed is a bit better and as we only had ward so far, it is ok to get the other subtype! Still I'd prefer mysticals.

@ Amarthir: I am also curious! The event was postponed, right? So we will see it some day!