I’m no engineer but wouldn’t the lower floors have that much more weight on it & possibly less chance of voids ?
My relative's chair and some other household stuff can be seen where his unit was (2nd flr) relatively untouched. If some of his stuff is unscathed, why shouldn't he and his family be?
I know that with each day that passes the chances decline statistically, but we're believers, and hope is all we got right now.