Year in settings doesn't match year on bottom case
I just bought a mid 2012 i5 13" macbook pro. Under About This Mac (and everywhere else in software) it is labeled as a 2012 macbook pro, but on the bottom case it says 2010. The serial number in software and on the bottom case also match. All of the screws look to be in perfect condition as well. I would just like to know why this is like this / what would be the cause of this discrepancy?
MacBook Pro