Mines a week 29.
It will be the fourth and fifth number in your product number on the box.
How do people have week 28 and 29's?
Just to clarify, go in your setting, general, about. look at your serial number. The 3rd digit will be an 8 (for 2008) and the next 2 digits, (the 4th and 5th) will be the week number.