I've shipped over 15,000 packages while selling on eBay and Amazon in the past decade. Very few of them were lost; I only recall about 5 or 6 packages that had to be replaced and reshipped  The ones that shipped overseas were the ones most likely to go missing. I'd say there may be a dishonest employee working in your postal office if this many packages are not being delivered.  Also, is there a possibility of a neighbor snagging them?
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		