The exterminator came today and got rid of the bees in my wall. The good news is that the bee hive turned out to be nowhere near as big as he had first estimated when he examined my wall last week. I think it only clocked in at around 30lb. The bad news is that it was nowhere near as big as he estimated (since I was secretly hoping to be able to brag about a 300lb honeycomb in my wall). Here's a photo I snapped of part of what he removed. There was more in the wall above, from which this large piece had detached itself.