Also in that Dec-27 article -

Connecticut State Police have said that all four weapons recovered after the shootings had been purchased legally by Nancy Lanza. Lt. J. Paul Vance, the state police spokesman, said the investigation, which involved state and local police along with the FBI and federal Alcohol, Tobacco and Firearms agents, could take several months.

So the two long guns in trunk of the Honda plus the two hand guns in the school equals... four.

I get it... Oh wait - I don't get it....