I really hate to hear that! What a shame. My bluebird boxes were used and young have left. I still have a couple that visit one of my 2 bird baths and they are beautiful. I had my 2 wrens that build a nest under my carport each year and they have raised their young. I put up a bird box on my back deck on one of the posts that supports the roof and had a pair of chick-a-dees checking it out and they finally used it and raised 4 young from it. We sure miss them. You could sit on the back deck and they would fly in with food and feed the young. While I was at TroutFest in Townsend, TN, my wife called and said she got to watch the young exit the box and fly away.

I hope your weather warms up a bit so the birds can feed.