Evidently the building housed a 5.5 ton meteorite.
I’m guessing it survived the fire.
Sad, but ironically funny. I'm going to be wild and guess arson. Someone has perhaps been pocketing valuable historical items to sell on the black market, or ebay. Inquires might have been made as to where are some missing items, and suddenly, all evidence is lost.
I'm just a very suspicious type person.
Along with many ancient artifacts that had survived ancient massive fires.