Carol
The birds do return at times following the last nesting and do bring some materials to the box. When I put my nestbox back up after cleaning on the 3rd nesting I leave the front panel door open. It stays open until October when the weather cools down here. That way they do not try to rebuild a nest in the box. They still come to it, hop around, fly to and from the trees, just to see if the box is still here.
Relax, they will be okay.
David
David
Stafford, VA