Possible Clues:

• What the dickens had Sydney to do with boxing?
• Cream container
• Pack-a-day man's purchase
• The vehicle isn't overturned with another vehicle on it
• Carriage on a package
• Container for a vehicle of such weight?
• Did the weight of the vehicle cause Sydney to lose his head?
• He lost his head - while boxing, perhaps?
• Does that contain the weight of the motor?
• What the dickens was Sydney doing with such a weight of motor?