Help Identifiying Critter

[Junebug]

I just went out and took some more photos. The bottom of the thing is all sealed up now. It kind of looks like an upside down lid w/handle has been attached. Now I'm thinking it could be a cocoon. If it is I guess I could cut the leaf off the plant and stick the leaf and bumpy thing in a breathable container until whoever's inside decides to come out.

I've been researching bees and wasps and haven't found a match or anything even close to what I saw earlier. Maybe the bee/wasp critter didn't have anything to do with building the little bumpy structure. He might have been interrupted by me while he was trying to eat the critter that was building this thing. Hopefully some OB bug enthusiasts will see my thread and share some info.