Found this thread whilst researching a similar issue
Purchased a 30D from out of Country supplier, camera recieved a couple of day prior to a trip to the states, give it a once over and packed it away.
My 30D then failed after 2 days of use on holiday (total failure - would not power-up), so i emailed the supplier while away, got no response
on holiday return i phoned them and reported a failed camera, and i asked them for a replacement, only to be told to send it to a Authorised Canon Repair centre, as it failed only a couple of days into ownership i wanted a replacment, so i refused to send it.
Then i noticed that the serial number on the body and the EXIF data were different.
EXIF Data in Light room
I contacted the supplier with this info and sent the above pictures, they then agreed for the camera to be returned to them for investigation.
I now have a replacment camera, and the supplier is investigating the issue with their supplier.
To be fair to the supplier they have been ok in resolving this issue, and i have been compensated for my troubles
My advice is buy local, it makes for a less stressful time when things go wrong