Based on Greg's and Peter's info, I'd expect to see at least one additional B flight for each before any C flights would occur, particularly given the extended storage period.
IIRC there's an arrangement in place between the US and Australia whereby aircraft built by Boeing for Australian customers do not need to wear N***** test registrations and so appear with their VH-*** straight out of final assembly (despite not being officially on the Australian register). I believe similar arrangements also exist between the US and other countries, too.
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