Why doesn’t some government agency ask the relatives/friends of Americans still believed in Afghanistan to make contact and report them missing? It would be a way of building a list of “maybes” which could then be “worked” to establish a list of those actually left behind.
It would be important to get relatively complete information on the missing person and on the person filing the report to catch trolls making false reports. If the list is only 100 or so individuals, as is claimed, this is not even a particularly onerous task.
The State Department would seem a logical place to house this effort, except for the fact that they’ve dropped the ball on Afghanistan so often they have no credibility left. Perhaps some GOP representative or senator could make the announcement and have his office begin taking reports of possible left-behinds.
I believe I've figured out why someone in a position of authority isn't already building this list. It is because they don't want to deal with green card holders and those with SIV status. But they fear being shamed if they admit they care little about non-citizen claimants, so doing nothing is the safer choice.