I just put 3 of my own eggs into lockdown.  I've got 2 EE eggs and one unknown.  I don't know if it was laid by a polish or my lone mottled houdan but it is fetile.  I just candled it and it looked great.  The other 2 I can't tell.  My light is not strong enough to penetrate the dark shell.
	
		
			
		
		
	
				
			
	
	
	
	
	
	
	