- The family disappeared two weeks before September 11.
- They left so hurriedly they didn't have time to pack anything.
It is common to see these strands built up connecting various groups as scapegoats to be used after the event. For example, the JFK assassination is full of such strands, various frames of guilt to be used as and when necessary by the real conspirators. This one is an obviously faulty story, so it wasn't used until they needed a last-minute anniversary distraction.