its not big deal, relax. You can tell that to judge if he ask you.Its not a mistake that can affect any decision making. Over a year buffer and no travel at all, not just during eligibility period but since entering the country. The mistake is not seperating volunteer from actual work. Let's say u were a volunteer before u got hired few month later by the same company, so i forgot to split it.
also paperworks are not done, they will enquire further documents or detail during InProcess after AOR but again dont do anything so far that can backfire your back.
so chill and let them do their job anything u give un asked can be used against U.