It's in my ANZ Securities act. this morning 4/4/17 dated the 31/03/17
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Received my reply from IRD that I sent in on the 3rd April, to quote: "The date on the certificate/statement will the be date you can use, as if we requested the evidence this is what we would use.''
On a different note: it took over a month to get a reply to my question from the IRD secured email service, but only a few days to get my refund, did a online application on Sat 6th May the refund was in my bank account on the morning of the 12th.