It seemed like the birds that normally move into these houses in early spring did not, and the House Wrens were not as enthusiastically promoting or inspecting them pending summer occupancy.
I had not had the opportunity to clean them out I think for the last two years (I think they moved in before I could get the chance last year)
…Both of the houses were filled from the bottom to the top — bottom 2 inches of moss and compost and with sticks all the way up to the opening and upper vents.

No self respecting lady wren was going to approve this kind of nonsense

I cleaned them out completely. They can refill from the scraped out sticks and moss or go find fresh material.
I have one other birdhouse that has long since been chewed up by squirrels, and one other one that fell down last year, and one new one that need to be put up as well. Busy, busy.