Nothing on the airport site.
Robert mentioned there is a small mailbox outside the terminal:
Gray mailbox for incoming mail with outgoing mail slot, located curbside in front of ticket counters.
I found a picture on Google Maps: It’s under the awning on the right hand side of the picture by the grey car (look for the blue sticker that’s the USPS logo). It’s probably a CBU, so don’t look for a regular USPS blue collection box!
Last Updated 22 November 2021