The Independent Police Conduct Authority and the courts have found police acted reasonably in their actions.
Mrs Wallace and her husband Jim are pursuing a private prosecution that police took away Wallace's right to life.
"When they came to tell me I said 'of course they have'.... Nothing will shock me now," she said.
Mrs Wallace said the two guns were kept in evidence because they needed to be tested to help build the prosecution case.
She had seen the locker in the exhibit rooms where the guns were kept and found it "far-fetched" that a member of the public could get in to the evidence room and open the gun case.
"There is no way anyone can get those guns out of that case," she said.
Mrs Wallace said police had asked for their weapons back a few years ago. Mrs Wallace had told them they were part of the evidence for the legal case they were working on, so they couldn't be returned.
She said she has been questioning the link between the courts and police, and whether someone from the courts would have interests in protecting the police.
She said she expected the private prosecution to be underway shortly.
General Manager of District Courts Tony Fisher said the theft of the firearms was a serious matter.
"The safe custody of exhibits is of the utmost importance to the integrity our court processes," he said.
"The discovery that the two firearms were missing prompted the Ministry to undertake a security review of its exhibit rooms and tighten procedures around the custody of exhibits."
A stocktake was taken of the contents of exhibit rooms in district courts across the country and found no other firearms were missing.
"There are very few firearms held in the courts and they are held safely. We know where they are located and who has access to them," Mr Fisher said.
A spokesperson for the Ministry of Justice said the Ministry is leaving the investigation in to how the firearms were stolen up to the police.
