"One little girl lost her doll that her grandmother had made her. She died from cancer last year so it's something that can never be replaced. All their medals, their leotards. Everything."
She said 13 people had belongings stolen.
"The kids were really upset. This was their first nationals. They'd had a fantastic time but this was a terrible way to end their time away.
"When my daughter came home from her first [nationals] she was crying because she had such a great time and didn't want to leave. These kids have come home with nothing."
The competition organisers are replacing the medals, she said, but it would be hard to restore the children's feelings.
"It's sad and not fair. The teenagers were awesome with the little ones, trying to console them. The team culture shone through."
The theft was reported to police in Auckland. Mrs Farkash said there were cameras in the car park but only to monitor vehicles going in and out.