And it turned out that beautiful clean coal is just that!

You could ban them from further sales. Or apply moar tariffs to them.

Even if they were stolen, you at least know the origin. But yes, it’s not easy to stop leaks of publicly sold items.

I wonder whether it’d be possible by tracking serial numbers. You might get the first customer.

That’s tricky though. Would you deplete it during night to have it empty in the morning? Wear expensive battery? Plus, I assume, car is disconnected from grid for most of the day (i.e. when you are at work).

Energy grid wouldn’t survive quick mass EV adoption most likely. Heck, how would you even charge a car if you don’t own a house - ideally parking places would have a slow charger where you could recharge car during night for cheap.