Ok thanks anyway guys.
(You can’t do a find for them, I tried. FCP appends “_sync” to the filename, but it doesn’t see it in search results.)
The problem is that multi-clip timecode gets screwy when exporting XML’s from FCP, which is problematic when you’re trying to online a job from FCP to something like Davinci.
Additionally, the “collapse” multiclip function is basically worthless, because there’s no way to do it permanantly. (The ability to uncollapse at any time means FCP is really just hiding it from you.)
Which means I have to find those clips by hand, and matchframe their replacement by hand.
Bummer.