The offices of Winston Peters confidante and trustee of the New Zealand First Foundation Brian Henry were the subject of an early morning raid by the Serious Fraud Office in February, before the Covid-19 lockdown.
Investigators took documents relating to the Foundation, which was said by the Electoral Commission to be in breach of electoral law in that it didn't declare donations that ended up being used for party expenses.
The matter was referred to the police who handed the file over to the SFO for further investigation.
Henry appeared relaxed about the raid, saying he was happy to co-operate with the SFO because the Foundation had nothing to hide. He said all the documents were in a box waiting for them.
Peters has also said in the past the issue had nothing to do with him and the party would be exonerated.