Sucks to hear that, a friend recently had the same thing happen to his 16" ornate.
On the subject of polys getting out, how many of you that have had one jump had euro-style bracing with a fixed lip all around the top of the tank? I have noticed that my ornate will put their nose up to the glass and swim pushing against it, while moving up and down. Sometimes they get pretty crazy and he can go out of the water and hit the bracing.
My theory is that if there was a gap or a lid that was light enough to be pushed off then I think he'd end up on the floor, but because the bracing is fixed in place he can't move it and stays in the tank.