The pair drove off the Bluebirds and took over the box. Not only did the noisy, pushy Wrens drive off the Bluebirds, they got downright noisy and pushy whenever I walked within feet of Strawberry Bush on one side and the Viburnum on the other. The only time I didn't "hear" from them was when I was riding Lucy June near them!
The day I went down there with my camera, I was hoping to get a glimpse of the little ones but had no luck. The adults were just doing "door to door deliveries" to the hungry nestlings, and I might add were very vocal as I approached and until I headed back to the house.