''It could have just been someone unfamiliar with New Zealand's issues with introduced pests.
''It's unfortunate for us because it was a big community effort to get those traps funded, and a lot of work went into it.''
He had learned from other trapping groups in the Wakatipu that vandalism did happen, but it was ''infrequent''.
A donation box at the Bobs Cove car park was broken into recently, and another by the Bush Creek track was broken into twice earlier this year, he said.
Wakatipu Wildlife Trust director Ting Zhang said the traps were there to save endangered native birds and wildlife.
They were tested to ensure predators were trapped humanely, were pet and child-safe, and traps placed by public tracks were clearly marked.
''These predator-control programmes are maintained purely by volunteers, and any tampering with it means the traps are useless until someone comes and fixes it.''
She encouraged anyone who saw vandalism to contact their local trapping group or the trust.