Surely nothing can be ruled in or out at this point?.
The Boxes (if intact) should tell a fair portion of the tale.
The speculation (for those who seem to be offended by it) is to do with a general interest , a fear that something similar should befall any of us and the hope the root cause , if it can be found, might stop it happening again.. it happens on every single similar thread here - if it does bother you it mightn’t be the site for you.
RIP to all.