There’s a terminal map that shows the location fairly accurately, but not 100%. (On the map, look in the lower-left hand corner.)
Robert wrote in with the location of an outgoing mail drop:
Outdoors in car rental parking lot.
I found it on Google Maps. It’s next to the rental cars in the “median” between the rental car parking lot and the terminal roadway. It is a 16-box grey mailbox so it likely has an opening in one of the boxes for outgoing mail.
Last updated 19 August 2018