He later found out the boar had found its way down to the beach to take a dip.
"It is not unusual for them, they are very strong swimmers.
"But the ocean is pretty rough and it eventually drowned."
It was a pretty "random" start to a Friday, he said.
"I have spent half of my life flying around the world for work, but coming home and seeing this really brings you back to the reality of life in New Zealand."
It had likely came out of a forestry block nearby, he said.
"There have been helicopters spraying up there recently, so it might have got spooked and run out."
Maraetai resident Shane Munro went out in his boat to fish it out of the water, but it had washed ashore.
Asked what he was going to do with the boar, he replied: "Put it on a spit mate."