Another salient point, the camera must be a LONG way out from delivery if they haven't already started printing brochures, manuals and boxes! That material doesn't just spring into being in the many thousands of copies needed overnight!
The contract to print for Canon must be worth a fortune! If they do it in-house, then they have control over leaks. If it is contracted out, there is undoubtedly a penalty clause for leaking info, plus that would mean the loss of your biggest client and that nobody else in the industry would touch you again... That would be the death of the company, so anyone printing the info would keep things absolutely quiet. Anyone who leaked the info would loose their job and get sued for millions.... it is not worth it!