Too bad she put a new floor over. You never know what may be in them, but it’s possible you may not WANT to know. I got my education as a cop and opened a few that were found in rivers, Lakes and gravel pits. The most money found was $100 plus change. The burglars spent that much in effort and didn’t get crap.
Anybody takes my safe, all he’ll find is my house deed, birth certificates, and other papers that are valuable to ME, but worthless to anybody else.