@baratang...you see from what I know, any ordinary beehive is occupied by a single colony. We have three categories of bees in the colony within the hive, the Queen, the drone (male bee) and the Worker (female bee). The three categories of bees are known as castes and each caste has its own specific task in the hive.
When the nectar flow is high during and after the rains the bee reproduction is high within the hive. If the bees run out of space i.e the hive becomes crowded, the bees starts a process which is a prelude to a sub-division. Once the process is complete, the queen with some of the worker bees (about a half) leaves the hive in search of a new home and to propagate further colony reproduction. This process is called swarming and those bees that you find clustering on a tree branch are actually bee swarms.
When these bees are hanging up there they do not feed as they have already eaten enough honey from the previous (home) hive bee leaving and they don't fight as they do not have anything (honey or brood) to protect except the queen. When the queen is under threat they really become mad.
With that in mind, what ate kayhara's uncle's honey was the large caste of worker bees foragers from the nearby hives.
...besides, the presence of a safe alone does not signify that there is money inside...