IPt means nothing. Canon would have to agree to give the name of the store that specific camera was sold to, the store would then have to agree to give the credit card number of the person who bought the camera, then the credit card company would have to agree to give up the name of their cardholder. There are a lot of “agree tos” in there.
Well, it would be possible to track him off the EXIF data… Now if he had his camera set up to mark each photo as it is taken with personally copyright information (Something routinely set up with the big SLR gear) it is a slam dunk. But like anon said, probably would need to Get Canon to say who bought it if they registered. The camera shop is also likely to have customer info. But if not, it will be a lot of hard work to track them down.
I worked in a camera store for a few years, and I don’t ever remember recording the serial numbers of cameras that were bought (although it’s possible that we did and I just don’t remember it–it’s certainly been awhile). The only time I remember us recording the serial numbers was if someone bought an extended warranty. So even if they can track the camera to the store where it was bought, I somehow doubt they’ll be able to determine exactly who bought it.