It always seems strange to me, once the blue or great tits have left the nest, that the nest falls silent.
After 10 weeks of activity inside the nest box, 10 weeks of checking video recordings & watching "live" when we get the chance, the last chick leaves, and the screen displays a static view of moss, dried grass and dog hair.
And the view inside the box will probably remain largely unchanged (apart from the addition of more cobwebs), until next spring.