How would the box answer where it's made of and if someone created it? Or how can it know al the answers?. And what if someone asked then if it speaks the truth? Because it always answers the truth what must one think if it answers that it sometimes tells us the wrong answer? It would still be telling the truth. The wrong answer could be given after we ask the wrong question. You can just state it can't give wrong answers but maybe a wrong answer tells the truth also (a wrong answer could be that there is only one god or that dreams are not real). We can always examine if the answers given are really telling us the truth. Again you can say that it always tells you the right answer but maybe there are more than one right answers.
The most important observation to make is that I see only one box in your story(and why should answers always be given in words?). Why shouldn't there be more of them? What is so special about the number one? That shows prejudice on the side of Nature! So maybe it's best to look ar your proposal criticially and question the very assumption you make. But if you really think that such a box exists, which is the same as asking if realty can give us only one answer if we question it anf if it can ever be known if the answers given are true. You can simply state that such a reality exists (as science or religion does, in general) but that's asking for trouble so to speak. How tells us which version of reality is the only right one? This approach has given much trouble in the world (Aboriginal children were taken away from their parents because they didn't give them the proper education corrrsponding to the real state of affairs). You can counter that it has brought enlightenment but that's only for the minds already biased. But let's for a moment that such a box exists (there must be of course such a box or more of them but the answers given are what matters; and the questions can influence the contents of the boxes ir reality if you wish).