Did you get the one in the clouds?
I'm in the same position, and I don't really get where you mean by that, unless you mean the Gusty Tranquillita.
I've gotten 6/7, one from each area besides Amilitae and the one that I haven't gotten on the warp list yet, though I know it exists from the Achievements. I'm on the "choice" part of the story and have done the sidequest unlocking the corpse you use them on, so I know I'm far enough to collect them all.