This is really getting confusing... so let me try to recap.
1) The first eBay link is to a bass, which is an obvious fraud.
2) Mica was on top of this, and (give or take a couple of hours) was working it before it was mentioned here.
3) Mica/Susan/Alembic in general are extremely proactive in dealing with these things (one of my visits was interrupted by a series of phone calls on just such a case), and they really don't need a bunch of us to play policemen for them.
Noble as it may feel to play knight in shining armor, it seems the best approach is to simply contact Alembic and let them deal with it directly. (Sorry, flax, but I just don't see any reason for you to have contacted the seller and eBay hours after Mica said she was working on it, unless there was some issue with the timestamps here.)
4) Now, the second eBay link is for a guitar... and if I read Mica's post correctly, there is a good chance this one is legitimate. Having studied the pictures, everything except the bridge looks pretty good to me, and Mica suggests they did make exactly one with this shape.
I think the question about the missing backplate is just because the guts are exposed, and maybe they did that to show the interior. So even though she talks about fakes in the same post, my interpretation is that the guitar referred to here is probably the real thing.
(But still pretty beat up, for $3500...)
5) No reason I can see to be so mysterious here: the earlier posting on this guitar had a parenthetical reference of (now deceased) to your dad, Mica, which has since been removed.
Obviously that was wrong, or you wouldn't have been posting later in the day - you would have missed him at lunch :-) And please say hi to Ron for me, it's been a while.
Just trying to clear things up and restore a sense of balance, hope I'm not off base.
-Bob