"I really enjoyed it, but when I sent it away, I just thought, 'that was a nice month or two'."
He soon forgot about the BNZ Literary Awards, and later struggled to believe he'd won the most coveted prize. After receiving a phone call from BNZ, it took a further phone call and an email before he was convinced.
"I wanted to get it in writing."
Mr Buck, who studied English at Victoria University and has worked at Unity Books and Random House, said reading and books had always been an integral part of his life.
"I have a huge amount of books.
"I'm one of those compulsive readers.
"Everybody in my family enjoys reading, a talk over the dinner table about a great bit of writing, and simply swapping authors back and forth."
Established in 1959, the BNZ Literary Awards, formerly the Katherine Mansfield Awards, are the country's longest-running short story awards.
Mr Buck said he was currently in Bordeaux, France, but his father, Te Mata Estate winery chief executive John Buck would accept the award on his behalf.