My two new M3's have stickers removed also.  My first couple had stickers on them in Chinese.  Looks like they removed them, but should have used a little Goo Gone, which is what I did. 

My first two are averaging around 12.1TH/s.  The second two have been running for about two hours and are pretty much the same.  I do see spurts of 13.5TH/s.