Those still missing after this much time in such an isolated small area must be nearly all dead, or never there in the first place.
Someone who actually cares will have to search land or tenancy records, since whole families were incinerated and may have had no outsiders looking for them. Unless, of course, helpful government agents destroy those records, saying they were burned in the fire.
This is so reminiscent of Pompeii. Those who could fled out into the water, where nevertheless, many whose lungs or bodies weren't burned treaded water unto exhaustion or drowned. In the ruined city long covered over by time, archaeological excavators are still finding bodies frozen into ghastly defensive postures as hot ash covered, smothered and roasted them. But nature sent that molten mess, not pompous greedy aholes like in Lahaina.
Given that Hawai'i is full of volcanoes, you'd think all the islands would have developed an effective fire response. But who am I kidding, when money and power wants what it wants?