We arrived to the Cambodia-Thai border zone and parked to the right just before the gate. There is an immigration office on the right with the windows clearly marked in English. We took our passports to the “Departure” window for an exit stamp and to hand in the departure card. They check your fingerprint and take a photo. They cared not a whiff about the bikes or customs. There actually is a customs office directly opposite, but no-one asked us to go there and in 5 minutes and we were done and thru the gate.