Buko began his career in the early 1990s and represented Northern Zone before first making the national side in 1993 after helping the Goroka Lahinis win the SP Cup grand final. He played for the national side in both the 1995 and 2000 World Cups.[2]
In 1999, Buko joined the Western Suburbs Magpies, playing in eight games at both wing and fullback. Buko played in the club's final ever game as a first grade side which was a 60-16 loss against Auckland at Campbelltown Stadium. The club merged with Balmain in 2000 to form the Wests Tigers and Buko was not retained, instead playing in Wagga.[citation needed]
Buko returned to Papua New Guinea and again played for the Goroka Lahinis and the national side. In the 2001 series against France his form was so impressive that the Limoux Grizzlies offered him a contract.[2]