The issue of feeding in a separate tub has already been addressed, so I won't go over it again except to say that I agree with everything that's been said so far.
But I have to say, I am a bit concerned here. Boas are typically garbage disposals and it shouldn't take a lot of effort to get them to feed. Have you tried live?? If not, do. Put a live mouse fuzzy in the snake's enclosure late one evening and LEAVE IT COMPLETELY ALONE for the rest of the night. A fuzzy is too small to harm your snake so there's no danger in leaving it unattended for now. Your snake will know the smell and will eat as soon as he feels secure.
If this doesn't work, I would take him to a qualified herp vet and have him checked out (fecal, blood work, etc). It is not typical of boas to not eat. They are not like ball pythons.
When you say that he's "only eaten once ever" do you mean that he only ate once for the breeder (as in once ever in his whole life)?? Or that he's only eaten once for you after you got him? If he ate for the breeder, how many times? And what was the breeder feeding (live or f/t, mouse or rat)?
As Gio said, while it's true that it's hard to underfeed a boa, that is usually in reference to a boa that is eating well. They can get fat quickly so less is better with them. But when an animal that normally has a strong feeding response won't eat at all, then that becomes worrisome. Hopefully we can tempt him somehow. Keep us posted!
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