According to the story in the link above, it was Jan. 7
Ddo not have time to research here as am going out; but it may have been Jan 7th; that the victims were found. They were MIA for a few days, if my recollection serves me. (And it may not!) But this would account for the days of rape and torture that the girld endured w/o benefit of early rescue; should a New Year's outing have been their plan.