I just can’t get my head around 38 people not sitting in the seats, all of whom would have checked in, and the crew not thinking something was amiss and not investigating 🤦♀️. Or, why OP’s first thought was to blame the ‘silly passengers’ and not the crew?
All their luggage was in the plane yet they were not in their seats. I’ve had a few flights where we were delayed as someone who checked in, had luggage put in plane, didn’t make it onto plane and plane was delayed while they searched for that particular luggage and took it off before we could take off. So, 38 people’s luggage (or thereabouts) and none of them in their seats plane is ????