Directions to Port Office Austin, TX : Port office located at Austin-Bergstrom International Airport - Approximately seven miles east of IH-35 (Exit 230) on Highway 71. - Baggage level floor (1st), far east end.
I think it is set up where arriving passengers exit the plane at Gate 2, and instead of turning to the right as they reach the end of the jetway and entering the concourse, that exit is sealed off and they continue straight and then downstairs to the customs facilities.
Also, look at the map of the baggage claim level. There's 6 carousels, but the one on the far left-hand side looks like it's walled off with two exits into the main baggage claim area where the other carousels are.
I think the carousel that is walled off on the map is the one used for customs. LoneStarMike
I think the carousel that is walled off on the map is the one used for customs.