OK, I’ll put you out of your misery.
In the end we sold them to a member of the local security forces who told us that he had a solution to the insurance problem and that he planned to drive them on his country estate, therefore private property and not requiring some of these pesky technicalities to be sorted out. I am absolutely sure that he did as he promised, and there is no way that he sold them on at a higher price to people in any nearby jurisdiction where it is easier to get vehicles regularised if you happen to have lost some of the papers. And anyway, it is none of my business if he did.
We still have a problem in one of our offices, which is not properly registered in the country where it operates (due to certain serious deficiencies in the local legislative provisions for non-governmental organisations), so we bought and registered a car in Belgium and drove it to the field. Now, of course, the problem is that it ought to physically return to Belgium every year for its “contrôle technique” (Belgian MOT) and other bureaucracy. This is immensely hassling, but is actually less complicated and time-consuming than trying to officially import it into the country where it spends most of its time.
This stuff really does give me grey hairs, far more so than the political disputes that we get into from time to time. By far the most dangerous activity that any of my staff engage in for work purposes is driving. The consequences of a crash in the middle of nowhere in a car that wasn’t properly insured, and the potential legal liabilities for my organisation, are pretty horrible to contemplate. I hope it never happens.