Can't watch clip here at work but I used to have an old Merc, the filler cap was behind a small plate next to the number plate. Used to amuse me every time I went into the village petrol station (not self-service) and the attendant used to wander round the back end of the car then eventually have to ask where the filler cap was. Did wonder why the same guy had to keep asking even after he'd filled it up a few times.