I live in Central Illinois. I had 2 strong hives in Nov of last yr. I hadn't seen any activity over the winter with any of them but also didnt see any dead bees in the bottom of the hive. I opened up yesterday and the largest one 40-50,000 bees was completely empty & clean on the inside. It had the appereance of how it would look if someone had vacuumed them up. The hive has aprox 45 lbs of honey in it, several frames of pollin & some un hatched brood. The last activity I saw the average temps were highes 40-50's & lows 20-30's. Any thoughts?