No argument there. They may have planted A black box. BUT, if its found, and obviously a fraud, then it will be pretty much assumed that there’s a larger plot, and someone is trying to hide something. If the black box was never found, then its just assumed the plane was lost at sea.
So if you’re trying to hide a larger plot, what benefit would there be to planting a fake black box? None.
Good point. I for one, hope it's down there, aircraft and all. That's one less potential WMD weapon aimed at us or Israel.