Found event for this couple Scheibenhard,67630 (Bas Rhin, Alsace, France) www.geneanet.org (just register for results)
only solution= find the passeport or "acte de notoriété"(replacing id certificate) in the Bas Rhin archives; complicated! It could give you a date (wide spread) of arrival in the states. In early march, list of passengers to america on line; I'll "adress" to this forum but nothing is sure. Contact back in mid march?