Here's the entryway to the Restricted Customs Area. Notice the Imperial writing, source unknown. Located in Spaceport THX1138, the Restricted Customs Area served as a customs checkpoint. Only authorized starport employees were permitted access to it; it was located close to where passengers boarded.
In the Star Tours: The Adventures Continue attraction at Tokyo Disneyland, you can spot the door that leads to the Restricted Customs Area. This area is off-limits to park guests and reserved for Disneyland employees.