I have Warn hubs, and they do not have grease nipples. Assuming the ones you have are similar, I cannot see why they would need separate lubrication, as the bearings and mechanism are open to the oil in the hub, which in turn is open to the oil in the swivel. 
I wonder if the grease nipples have been added to provide a grease barrier to keep oil from leaking round the operating lever (there appears to be no seal there!) or if the hubs and swivels had been converted to grease, leaving the locking hub unlubricated. Note that while grease is reasonably satisfactory for the wheel bearings, use of conventional grease in the swivel housing will result in premature wear of the swivel bushes and bearing.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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