Hey there, just noticed an odd glitch happening with my 5D MK II... I've never had much reason to pay attention to EXIF data coming out of this camera, but today I happened to look at the serial number. Interestingly enough, the serial number that Lightroom 4 is showing me doesn't match up with the serial number on the bottom of my camera.
In case it's relevant, this camera was a rental unit at Flashpoint Photography Rentals in Vancouver for a number of years. I'm a productions manager there and we bought the camera new from a reputable retail store. I used this camera many times for the past two years, until buying it from work when the Mark III came out.
Any ideas how this would have happened?