Lawyer Jock Blathwayt handed up a letter to the court from the farm's owner who had asked the young men to kill game birds causing havoc to new pastures on the property.
In the letter the farmer said he felt partly responsible and spoke of how apologetic the men were about the incident.
They offered to pay $1000 to Fish & Game.
The pair thought it was okay to kill the game birds without a licence and didn't realise it was out of season, Mr Blathwayt said. The hunting season doesn't begin until May.
Marfell is a rural fire officer while Williams works for a machinery company.
In sentencing the pair, Judge Jan Kelly said they were both of good character and a conviction would put their jobs in jeopardy.
"You have shown nothing but remorse," she said.
She discharged them both without conviction and ordered them to pay $1000 compensation to Fish & Game to be paid by November 20.