Don't you give him any credit for his creativity?
According to Irvin, the stuff belonged to a friend. Irvin found it when he frisked him when he invited him to his house for Thanksgiving.
Irvin didn't want to throw it in his garbage because he was worried about people searching through his garbage. So he stuck it in his car, planning to throw it away somewhere else later. But he forgot.
That's why I don't do Thanksgiving anymore. The security checks are outrageous.