Sounds like your bees may have been the victim of the new disease that's ravaging bee populations all over the country, Colony Collapse Disorder. Unfortunately, the politicians are too busy killing people in foreign countries to devote money to finding a cure. My advice would be to clean out the old nest as thoroughly as possible. We don't yet know if Colony Collapse is due to bacteria, mycoplasma, virus or whatever. Conceivably it may be due to some other cause, such as pesticide poisoning, but that seems unlikely due to the widespread nature of the malaise. Until we do know, it's best to be as sanitary as humanly possible, washing all equipment thoroughly in case there's a virus lingering on the hive or equipment that can re-infect a new swarm. Best of luck.

The wax moths moved in after the hive was dead or close to it. The hive most likely died of varroa mites or simple starvation. Last year's drought took out alot of bees. Most of us beekeepers were feeding heavily in July and August to keep them alive. You may get some new bees during the spring swarm season, but unless you get them into a real hive that you can manage, this will be a never ending cycle of dieing off.