The Electoral Commission is adamant that anti-euthanasia flyers weren't added to EasyVote packs ahead of the 2020 election.
This comes after The Spinoff reported on Monday more than a dozen voters received flyers produced by euthanasia referendum campaign group VoteSafe inside their EasyVote packs.
VoteSafe NZ is a public information campaign and has no official association with the Electoral Commission.
In a statement on Friday, chief electoral officer Alicia Wright said they're confident that no unofficial material was included in the packs.
"We have conducted a thorough investigation and are satisfied that the packs contained only official material during production and delivery," Wright said.
"Every scenario for the brochure to be inserted into the pack or swapped out with other material has been looked at and eliminated."
"Past experience tells us that when a lot of election material is being delivered, people sometimes think that items have arrived together.
"We would like to stress that we have not seen any evidence of interference or foul play and none of the people we have spoken to said it looked like their envelopes had been opened," Wright added.
The EasyVote pack, delivered to 3.3 million enrolled voters, included a personalised letter, a card or voting slip, an official flyer on the two referendum questions, a brochure explaining MMP and how to vote - with the Electoral Commission's logo on the front.
VoteSafe NZ campaign director Henoch Kloosterboer told The Spinoff they had absolutely nothing to do with the flyers ending up in EasyVote Packs.
"VoteSafe is running an honest, ethical campaign and we don't want this hampered by suspicions caused by this debacle."