David, have you considered seeking professional advice?  I imagine there'd be experienced investigators in this field, which strikes me as not unlike family tree research. With all the data stored these days and computer searching and so forth I wonder if they can match things like DOB and narrow the field.  Just a thought and you may have explored it already.  Anyway good luck in your search, it would certainly be grand to solve the family mystery as you say. Cheers, Tony.
		 
		
		
		
		
		
		
			
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				One of the original Australian CMP hunters.
			 
		
		
		
		
		
	
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