Wiki isn't right about library edition Issue 3 at least. It says here
(don't open the link, the cover pic is spoilery) that it contains 3 web comics (titles tagged as potentially spoilery)
that take place around issues 21-22.
If they're including the web comics, I assume that they're including the one-shots as well and Wikipedia just has incomplete info, since those library issues haven't been released yet. My guess is that the Willow one-shot is in Issue 1 or 2, and the Riley one in Issue 4.
According to this, Issue 1 contains two one-shots. If they meant Always Darkest as one of them, which is the other? http://www.darkhorse.com/Books/18-89...on-Volume-1-HC