You should book in to attend an inland border facility in advance if the goods you’re moving:
are going to an office of departure or office of destination (starting or ending a transit movement)
are covered by an ATA Carnet
need a CITES permit
Regardless of why you attend the site, if your goods have been flagged as ‘held’ for a compliance check, you must let front office staff know about this upon your arrival. You can also check if there are any delays at an inland border facility.