Another thought about EXIF data is that it was never intended for forensics, so if you download a photo without taking precautions to preserve the date it will default to the current system date.

And don't forget that if the data are there to be viewed, they are also there to be tampered with.

It gets really interesting when you find GPS coords in the metadata..... :-P
You own a camera that expensive?..............you get paid too much