Adult boas can go a long time - months - before needing to eat. So if you wait him out you'll have to accept that he may not eat for quite a while.
You can continue to try scenting, or you could try to offer him a f/t mouse and as he's eating it, try chain-feeding a small rat behind it so he starts to associate rat scent with food. It does take practice, and a quick/steady hand to make this work though.
At his size you could also try rabbit fuzzies, those are about 80 grams (give or take a bit) and the smell is different enough from rats that he may take them instead.
Finally, make sure his temps and humidity are correct, if he's too cold he won't eat.
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