Should we still fill out FAFSA and CSS?

Thank you for the replies. Based on EFC calculator, our EFC was above COA. So we didn’t bother to fill out FAFSA or CSS when my son applied for the private university (Emory). But I heard that some schools do give out some money. So I was wondering if I should just fill them out for 2nd year if there are no negatives. If our EFC is above COA, can we just fill out CSS (not FAFSA)?