Can you visit the Goffin at their home for a bit? That would be a very good idea.
My G2 has been with me about 35 years and was wild caught. So, I think he has some differences from store breeder birds.
But some things will be the same, such as:
He gets up with the sun and stays busy all day.
He likes to invent games, chew wood, shred cardboard, and take things apart.
He is an escape artist and so there are 5 padlocks on his cage. He's out within seconds if any one isn't locked. He chewed 2 window frames and a skylight before we figured that out. He has removed bars of his cage also, so a strong cage is needed.
He has his set times when he likes to "sing the song of his people" but other times he's quiet. Unless of course he is given an excuse to yell, like the FedEx truck, a deer, another of the flock yelling, etc...
Not really food motivated, likes drama rewards and scratches better.
Is independent and not as clingy as some larger cockatoos become. He play, visits, then leaves again to do something else. Not a long attention span unless he is destroying something.
You really do need a good HEPA air filter!