this is just one of thousands of possibilities... im not siding with anybody here, okay?
The husband could have pretended to be a supplier to a gang, transacted business that he will be supplying a merchandise and intentionally not deliver the goods [as he does not really have the goods]. Or misdirected the other party and advise them [the gang or the boy] to pick it up somewhere [like in the trailer home] and get it from a person[wife].
Looks like the teenager knows what he need, where and whom to get it. He is damn sure about it that he is willing to hurt anybody lying.
"The source said the boy had ordered equipment for the pot growing operation and mistakenly thought the supplies were delivered to Horowitz and Vitale's home."
Now, he or his gang ordered special equipments for unusual type of business but not so sure of his opr their own business ey... the boy lives near the house of the Horowitz and Vitale's home.
The boy perhaps is willing to pay for the transaction and, with special funds... sounds intelligent people...
... the only problem was he just doesn't know where and to whom to pick up the item! unless somebody actually told him [the boy] where exactly to pick it up.