III of article 806, with the exception of its third and last paragraphs, is applicable to public administrations, institutions, bodies, companies, firms or persons designated in I of l’article 806 who are custodians, holders or debtors of securities, sums or valuables belonging to an estate that they know to be open, and devolving to one or more heirs, legatees or donees whose de facto or de jure domicile is abroad.