Why does the scammer need to contact them? Why can't the warehouse call and go "Uh, we seem to have your shipment, I don't know why it was off-loaded here, but

Why does the scammer need to contact them? Why can't the warehouse call and go "Uh, we seem to have your shipment, I don't know why it was off-loaded here, but now that it's here you need to pay us"?