Hmmm ~ so the nest was on the new property's house and they 'covered it up' with soffeting? Cause ya they are likely flying around trying to find the Queen if she was in there at the time?

Evening is the best time to 'kill' the nest or 'relocate' them depending on your views over it.

When we w ere having an issue with Wasps I just used the front door and we went to the park for outside time until my spouse could get the backyard safe again for play~