Perhaps you may recall another stowaway incident at LAX. It had occurred on an inbound Air Pacific 744 flight from Fiji just a few years ago. The ground crew were in shock as they witnessed the lucky stowaway climb out of the left main body gear well, and sprint away across the tarmac. Though he was captured, it is still a mystery on how he had survived the 11 hr trans Pacific flight!
It was theorized that he had stayed warm while huddled to the pac ducting, and that also perhaps the airtight gear door seals had saved him.