There was one Warre hive which went into fall with a very strong colony. The hive was treated several times with Oxalic acid vapor. No honey was harvested on this colony. For some reason the hive was abandoned. No dead bees were seen in the hive and only a handful of bees were seen in the bottom of the hive. These dead bees would most likely be a result of the extensive robbing of the extensive unused honey stores and not the original colony.
A perfect looking hive but simply no bees. Perhaps the bees abandoned the hive.