Proof of Good Faith - S1.E10

Having succeeded Don Vanetti, Nero decides to send a shipment of Lawless Heaven to Don Galassia to make way for the family's expansion. While the rest of the family searches for Corteo, Nero assigns Avilio to the task. He boards a boat to Chicago with his trunk. But where is Corteo? And what was the motivation behind the one who sent him the letter?