Specifically:

Tifa's Theme (Piano Version) - I've looked everywhere for this and can't find it (and it has quite a different sound from the Piano collections sheets, which I have).

and

Tatakau Monotachi (Piano Version) - The fight theme, played during the Tifa v. Loz fight.

These might not even exist, I don't know if the music for FF:AC was ever printed since there were only two piano tracks, but if anyone has these (and again, don't point to the Game's Piano Collections, I know those...) I would be extremely grateful. Thanks!

EDIT: A print collection does exist! Just surprised no one's upped it, like anywhere.

Update: Link to the book (http://www.play-asia.com/paOS-13-71-135-49-en-70-260d.html).

xD xD
You might need to readjust your ears. The piano collection versions are the one's played in the movie. In you listen to the advent children soundtrack and the ffvii piano collections soundtrack they are the same :3

Wow, you're right. I was comparing it to the original FFVII piano book, not the collections book. This book is still worth upping if someone's got it though, since it has a bunch of the other tracks (like Sign and Cloud Smiles) for piano arrangement.