Yeah they probably will eat him as soon as they think they can. Sometimes even before they can they'll give it a shot. I just wanted to ask the color to check type.
Unfortunately because Oscars are so commonly sold you might have a hard time finding a buyer/taker. Have you tried calling local fish stores to see if they take fish? My local (Tinley Park, IL) takes fish in. Some stores will simply kill the fish rather than re-sell it, but I'd obviously prefer that wasn't your option used. Try calling around a bit.