There are a few that I know of that are in private collections. But they are the 'imperfects' - i.e. missing sheaths, replacement sheaths of lesser qualities, sheaths and hilts with the gold and gems picked off, corroded blades (oh this is the saddest part -- you could see the blade was once magnificent, but now it's eaten away here and there).
As collectors, we can only hope for the best and when 'the one' comes along, give it our best shot.