The released weapons list the other day, gave no mention of 15 rd mags. I suspect they weren't there[uncommon mag]. If they were, they probably came from the Glock.
Even looking back at the 911 tapes, the initial report was a rifle and shotgun. That was immediate. Within the first 30 minutes. I didn't see any evidence of a shotgun being found until they opened up that trunk, hours later. Odd.
The police searched the vehicle before entering the school and must have found it then. There were two mothers at the front entrance of the school shortly after the police entered the school who saw the doors of the car open and stuff from inside strewn about outside the doors.