Sounds like a good deal to me.  The chance that someone could have found a replacement forend exactly 10,000 SNs apart are staggeringly small.  This could be a very rare case of someone picking up the wrong punch. 
 
My 16 ga of exactly the same configuration below: 
 
P.S.  How did a Connecticut Yankee get a name like Jeff Davis???
		 
		
		
		
			
		
		
		
		
		
		
		
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