I would donate it back to them or to another group to re-raffle off.
There was a raffle at the rural Rescue Squad we were part of in North Carolina. It was for a donated Gun Safe. The gentlemen that won it said that his wife would never allow it in the house - she didn't allow guns in the house. So he donated it to the fire department he was a member of and they did a raffle themselves. The rescue squad had made almost a $1000 and the fire department made over $1500.