He found Hepi with friends after he'd used the card to wrongfully withdraw the money.
When arrested he told police he decided to check the balance, withdrawing the money to buy food and alcohol for himself and his associates.
Lawyer James Elliott said his client was extremely remorseful and deeply regretted stealing money from the man who had been supporting him since his youth.
"This was an opportunistic act committed under the influence of alcohol ... there is an ongoing relationship ... he will be doing odd jobs, like lawn mowing for the complainant," he said. "He does sincerely regret his actions."
Judge Tuohy said it was amazing the victim was standing by Hepi.
"You are fortunate the man you stole from is a forgiving and compassionate person," he said. "I think you will turn a corner with the right support."
He sentenced Hepi to nine months' supervision and ordered he pay reparation at $20 per week. He also suspended sentence for nine months.