Sweet Dreams (2005)

Michael, a lonely, timeshare salesman becomes obsessed with an unmarked box after it mysteriously arrives at his motel room door. When Nancy, a stranger, knocks on Michael's door and asks for ice, Michael is convinced she really wants the box. After an interrogation, Michael realizes Nancy has nothing to do with the box. Nancy, however, finds the much coveted package and decides Michael owes it to her for his mistreatment of her. A battle ensues.