Owen was at work when he received a teary phone call from his daughter.
"She said, 'Dad, I have some bad news'," Owen said.
"Nia had had that board for at least a couple of years. I especially painted it for her. She would come in and watch me paint it."
The family travelled 40km before they noticed the board missing as they filled up their vehicle at a Towai petrol station.
Owen said they immediately backtracked all the way to Okara in search of the missing board.
"If the straps had come loose both boards would've fallen off with it as well. Most likely someone has managed to wriggle it out of the straps."
While Nia can borrow a board from her dad as the family hit the surf together, Owen said it's just not the same.
"She was so excited the day she got the board. She knew she wanted it blue and she picked some sunflowers to go on it. She was chuffed," Owen said.
Anyone with information can contact Owen at HC Surfboards on (09) 432 8110 or 021 033 7047.