False Passport Conundrum
It has been confidently started in this thread that it would be very difficult indeed to get through an airport using a stolen passport.
It has been confidently stated in this thread that a significant minority of any passenger manifest may be expected typically be travelling on such documentation.
Undoubtedly one of the above is overconfident.
I don't recall past incident passenger manifests triggering such reports of bogus documentation, and if I were investigating this I'd be very curious indeed as to who was travelling on those passports: such as how, when and where they bought their tickets.
Incidentally, I wouldn't regard the FR24 track as definitive, but I would regard it as evidential. I doubt the plane crashed during the time it was tracked as being in flight. I'd regard just beyond the end of that track as a place I'd be very interested to look at: which is not to say I'd be certain of finding anything there.