Sometimes, it can be a case where someone is still alive, but hasn't yet communicated with the person that reported them missing for whatever reason. After two weeks, however, I imagine that most of the missing will never reappear.

More than 1,000 people were missing [1] in the Camp fire. 85 people died.

[1] https://www.npr.org/2018/11/16/668552010/more-than-600-peopl...

Yes, unfortunately. It’s not like these people were hiking in the wilderness and might be found alive. They’re buried in the ashes of the fire.