I saw only one gun safe in my 2 weeks of helping clean up. I think it started out about the size of a liberty fatboy, but when we found it, it was a 1.5ft tall blob of metal that had completely melted. We had to borrow a neighbor's bobcat to dig it out and lift it. The owner just had us throw it straight in the dumpster with the bobcat. Owner recalled that it had a "2 hour" fire rating. The ash and debris filling the foundation of his house was still hot in some spots 3 days after he was allowed back in.
Anyway, back to metals of the precious variety...