Oh , yes , they will find him.He has his Identification Number - this number should be present , ON ALL OFFICIAL DOCUMENTS AND ON HIS TAX AND SALARY BILLS.

So , on his driving license , on his bank loans /mortgage etc.
Unless he is a millionare and can move to his private Island in the Pacific Ocean , they will locate him.

But , the other side of the coin is , to start a legal procedure through court.To locate his where about.
Yes, it can be a lenghty and costly process (although she may get a pro deo lawyer from the state )