"We're all absolutely disheartened," Baker said. "The school has paid for the tournament fees for now but it was up to the girls to pay them back.
"We're a Decile 2 school. We're not sure how we're going to cover the shortfall."
The school was very proud of the girls' initiative and hard work preparing the firewood, he said.
"One of the girls came up with this idea and then they all got on board with it. They're all very committed to training twice a week and they put a lot of work into preparing the firewood.
"They were here for a couple of hours three or four days after school last week getting it sorted.
"They'd hoped the money would help pay for tournament fees and they were also hoping to get hoodies, but I don't think that will happen now.
"We're all gutted."
Baker believed the firewood would have been taken by someone who knew about the fundraiser.
"We purposefully kept it out of sight. Someone, or a couple of people because there was a lot of it, must have come on to the school grounds with a large trailer in the evening when there was no one around."
A police spokeswoman confirmed the matter had been referred to police.
Anyone with information about the stolen firewood is asked to call Henderson Police on 09 839 0600