Official Information

The FAQ has some good information:

There are two U.S. mail outgoing mail slots in the bank of mailboxes located in the entryway under the skywalk that goes from the terminal to the parking garage.

User-Submitted Information

Robert agrees: there are silver mailboxes located on the first floor next to the elevator to the skywalk. So these are inside the terminal itself.

Last Updated 22 November 2021