Re: Larvae found outside hive??
In addition to the possibilities already mentioned.....Occasionally, burr comb or ladder comb between the top of the frames in a hive body and the bottom of the frame above is used by the queen as part of the brood chamber. When you inspect the hive, larva can be exposed or otherwise killed as you break the comb loose to remove a frame for inspection.
Brood that is dead from a chill, or even some brood diseases can also be taken out front of the hive: More possibilities for seeing dead larva.
...We Don’t See Things As They Are, We See Them As We Are...