A man who was told after a knock at the door that he was $22 million richer initially thought his visitors were real estate agents.
He now says he is "really, really chuffed" that he was tracked down - after not bothering to check his ticket because a workmate said the prize had been claimed.
Lotto NZ officials had tracked the Christchurch man down after he had failed to realise he was sitting on the winning Big Wednesday ticket.
Lotto's gaming system records every ticket bought, including the purchase day and time, and method of payment. If a bank card is used, Lotto can work with the bank to get information to the customer.
In this case, cash was used, so Lotto worked with staff at Pak'nSave Riccarton to track down instore video footage which eventually narrowed the search to one person.