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This was found by one of the school caretakers at my children's school (Botany Downs Secondary College, Auckland). It weighed 4kg! There are more of them where it was found.
I have just picked up on this thread so have not commented earlier. What you have got is Phlebopus marginatus, also known as Phlebopus portentosus. It is a bolete but is different to the familiar European ones. It is also found in Australia and in South-east Asia extending north into Yunnan. The Chinese and the Thais eat it considering it a delicacy. A considerable amount of work has gone into learning to cultivate it.Boletes particularly Suillus are common in New Zealand and are associated with introduced conifers.
Probably this is the last mushrooms this year ...