davewillread: It took me longer than I intended to perform some maintenance on the cache, and in the end, my efforts proved unsuccessful. I sprayed the area with some nasty stuff and I checked back today (several weeks or months after the initial action) to find that the nest is alive and well. Removing the unwanted winged pests (and keeping them out) is going to be harder than originally thought, if not impossible.
So, though I'd rather be re-activating the cache today, I have chosen to archive it due to the persistent wasp presence.
Thanks to all who found this (my first cache) and for those who didn't have time to find it, I apologize.