Hey, Kyle. It's pretty simple, actually. When I win a fifth-generation plushie like Darmanitan, I know that it almost must be a new one, because we hadn't yet reached Black/White when my list was lost. If it's not on the list of the plushies I've earned since then, it's obviously new.
If I've said that any others were "another new one for the collection," then I just momentarily forgot that my list wasn't up to date. It's possible that I mistakenly made a comment like that -- sleep deprivation will do that to you.
Anyway, let's continue with an L.