I was looking through ebay and found a "used" d90. In the item description it says that it has 4 shutter actions. 3 of them were him testing the camera. It also says that it was preowned. My question is this. Is there anyway someone could get into the camera and change the exif data to only show 4 shutter clicks? I guess the previous owner could of shot in raw format the entire time. I just want to make sure that this information couldnt of been erased from the camera or changed. Thanks.