Transfiguration has been assuredly ruled out, as there are no trace flaws whatsoever.

There is no way to determine if the body is Norah, as it's a match to Barty in every way. The coroner is re-running the toxicology spells to see if there's a positive for polyjuice, which I suspect there will be.

In which case I suppose we shall have to make scans for polyjuice a matter of course for all autopsies now, to avoid such embarrassments in the future.