One Nation’s claim to the seat of Narungga has hit a snag weeks after the South Australian election.

Uncounted ballot papers were discovered on Thursday, forcing a recount in the Yorke Peninsula seat, which One Nation’s Chantelle Thomas won by just 58 votes.

More than 80 unopened papers have turned up, the state electoral commission has confirmed, offering a sliver of hope to the defeated Liberal candidate, Tania Stock.

The commission had already done a recount on the knife-edge seat.