I'm no expert but I had a similar experience. I bought an adult female import many years ago that refused food for 14 months. She never lost weight or declined in any way, just wouldn't eat. I tried everything I could think of and then one day she just changed her mind and ate weekly for the rest of the time I had her.
Just be patient, give him plenty of quiet and privacy and keep offering food with as little distubance as possible.

John

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