it is very normal not to release details of such a report
I know, Ohthatsexciting, and a PP explained the principle far better than I could, but if there was any remaining doubt as to why you only have to look at all the posts suggesting folk know what's been found, that it's "obvious" why such-and-such happened and so on
It'll probably be said that publishing would settle this, but given the tsunami of online imaginings that would follow I can't see it myself - and that's without whatever H&M may choose to say
As said, it's possible that the palace have decided to let sleeping dogs lie this time, and for once I can't say I'd blame them if that was so