Matenga told police he went to the airport because he thought his ex-partner was arriving there and he wanted to greet her. He said he stole the bag because he had the "opportunity" to do so.
In the Manukau District Court last month Matenga, who has a lengthy criminal history dating back to the late 1970s, admitted a charge of theft.
He was convicted and sentenced to 200 hours' community work.