I have a boy that has been off food for at least six months. I would not start to worry unless he begins to drop significant weight. I say this but I always worry when mine don't eat.
Things you can try that have worked at least once for me. If you are feeding F/T. When he constricts, continue to move the rat a little for about one minute in order to simulate death. He should constrict harder. For some reason this seems to make them want to eat.
Feed live rat.
Last resort... feed live mouse.
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