Re LES MISERABLES, Valjean and Cosette are packing (as they prepared to leave France) during the Act I finale. Thus, they haven't gotten on the boat yet. Also, Valjean has told Cosette that they won't leave until the following day and it's still the night before when Act I ends. Valjean doesn't change his mind until after he has confiscated the letter from Eponine and read it.
Salve, Regina, Mater misericordiae
Vita, dulcedo, et spes nostra
Salve, Salve Regina
Ad te clamamus exsules filii Eva
Ad te suspiramus, gementes et flentes
O clemens O pia