This is Scruffy again in Box1. It looks as though she has something in her beak.
Now she has dropped it.
Here she comes again with more nesting material. Perhaps things are getting serious!
She still has it in her beak.
This shot was taken two hours later and the nesting material is nowhere to be seen.
Ten minutes later there is a more stuff in the nest box, but there is a long way to go before she can think of laying eggs there.