the skeptic will say 'we don't know' as a matter of course.
anyone who insists it is . . . and starts to badger about it . . . is not being a friendly anon.
and too often it's has the form of a set up.
the rule: it can not be reported as without the tripcode as part of the header for the post even if Q posts as the same ID further down (or above) in the bread.
so it's not a Q drop.
end of story.
that's not saying it isn't from the team.