It's more than likely that quite a few sectors went by with human remains in the gear bay. Most incidents I know of started in Africa/India/Caribbean then the unfortunates travelled the world for some days as frozen corpses, eventually found when someone did a better-than-average PDI.
It's unlikely to have begun in a 1st world country as most of the population can a) afford to pay and b) know that 10hrs @30,000'+ = death. There aren't people and animals wandering around near the runway as a matter of course, either.
The 777 nose gear has a nasty habit of crushing those who try to hide away in there and pushing the resultant mess where a good look is needed to find it... Not a pleasant discovery.
