They had started a nest in a different Nest Box earlier in the week, and then last night they started a new nest in this Nest Box. This Nest Box is located at the same spot before where they raised 5 Nestlings, just a new Nest Box that I placed there.
5/14/24 The pair check out the new Nest Box
5/15/24 Female starts building the nest
5/19/24 Nest appears to be complete
5/20/24 8;30am Egg #1 appears