Lotto NZ counters can open at all traffic light settings, however, live Lotto draws are unable to take place while Auckland is in red.
Last week it was revealed a Lotto ticket worth $8.25m was sold at the Matamata Paper Plus.
Owners Graeme and Kate Guilford have posted on the store's Facebook page, urging the winner to get in touch and offering to open after hours to process the paperwork and validate the ticket in private.
Matamata-Piako mayor Ash Tanner said it was exciting times for the district, which was on a winning streak. A $4.5m Lotto ticket was sold in neighbouring town Te Aroha in January.
"We just need Morrinsville now and we will be away," he said.