Whiles the CO may request to see your document at the interview he is not bound to do so. In fact, in a majority of cases, the CO may adjudicate your eligibility for the visa without looking at your documents. Since the B visa is generally not a documentary application, your eligibility for the visa is not conditioned on the strength or weight of your documents. Nonetheless, it is always important to carry along your documents even if you think the CO will not look at them.