Had some in an old coalshed
A few years ago, I saw wasps flying into and out of some planking at the top of an old coalshed. There were non inside but I was sure I could here rustlung up in the roof.
I blocked the knot hole with "plastic wood" which some of you may remember from woodwork lessons in school. A few days later they were comming out of a different hole so I blocked that one and then went round and blocked up others. No more wasps around.
A couple of years later, we were getting some work done and they were going to replace the roof. I told the people doing it. When they got the roof off, I had a look. It was larger than my head and apparently full of dead things that could still sting you.