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Insurance is not your problem here.
But you should’ve signed on the title of the car
with the date and the buyer’s name and given it to the buyer.
The buyer is supposed to register the car in certain days from
the purchase date. If not, there is late fee.
If somebody drives your car without the transfer of ownership and
have an accident,you would be held responsible, I think.
The thing that you didn’t pay the premium is not a problem if nobody drives the car.