While sound experience often gives a quite ok answer within seconds, I agree that serious examination up to scientific standards would be preferable; DNA sequencing may even narrow down the origin (of the material if not the whole piece). 
 
Regarding marine ivory, I guess  that many pieces believed to be Dugong are much more likely sperm whale; the latter have been regularly caught throughout the archipelago and a single whale yields a lot of teeth while obtaining a really large male dugong seems less straightforward... 
 
Regards, 
Kai
		 
		
		
		
		
		
		
		
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