The evidence on the floor of Hive E pointed to an occupation. That is exactly what has happened. At some point in the last few days a swarm has occupied Hive E. Welcome to Colony 12.
The signs that this was not a robbery included detritus which looked too dark to be from capped honey. That was a sign. The most striking thing though was the Wax Moth larvae. An infestation of Wax Moth must have been under way because there were 3 or 4 larvae on both times I looked.