Thank you. I know how to do math to find them, but my question is why?  This is absurd.  I can build an all Meraki Site-to-Site WAN in my bathing suite on a remote island,  but I need to do calculations to find my WAN Mac Addresses if one of my sites is in a Regus Office and they need to know the MACs to allow access. 
 
Ubiquity shows them right in the GUI and costs about a 5th of the cost. 
 
Just saying, please display this in the GUI.  Doesn't seem like it would be that hard to do.