I think the guy who started the thread in POTN wanted to get it repaired under warranty.
DR said fine, ship it to us in HK but you will have to pay the £120 shipping excess as they only cover £40.
The guy said, no way ! I want it fixed here in the UK as advertised on your website.
DR said fine, send it to Canon UK and DR will fit the repair bill.
Now, this is where I don't understand.
Did he send it to Canon UK and ask for it to be repaired under Warranty, or did he send it to Canon UK and asked for it to be repaired? (although since the camera was released world wide under 12 months ago it is under warranty anyway and no need for an invoice, may be that's why Canon asked where he bought it from.)
Did he send in the invoice from DR?
I understand Canon's stance in trying to control the market of their product distributed but in this day and age, people travel a lot and there is nothing illegal or even unethetical about buying something aboard. My excuse could easily be that my main camera died after the airline lost it and I was on my way to a location shoot and needed one right then so I bought one whilst out there.
I really don't buy the whole fake serial thing. What reason is there for a retailer or person to replace a legit serial sticker with a fake one? A new camera with a serial number is unregistered. If you are going to replace the serial sticker, you replace one that is stolen from a user because it is registered. To fake a serial number on the body and the box but the camera is real? Makes no sense. It sounds like the serial is just not registering on their system.
Then again, the moral of the story is that to buy it on credit card.