One per person is legal. Maybe they could take two each.
They should not be able to take 300 per four people without proper customs declarations. The question is, if they made the proper declarations, would they be allowed.
The question for you is this: Should they have made commercial declaration on the large number they were trying to bring?
Simple enough question. What do you think?
I don’t think we would have confiscated 300 bibles from a Chinese national bringing them into the United States of America, even if they hadn’t been declared and were discovered by customs agents. Or books on the sayings of Confucius, for that matter.
The bibles were obviously not rare books on the world market, nor were they intended for commercial profit in China.
The obvious point is that the Communist government of the People’s Republic of China appears unwilling to allow the free distribution of bibles.
Even if those people /had/ made the “proper declarations”, would they have been allowed to take them in? I think not.