Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Last year I could not. It took a lot of effort for this to happen and manager in one of the MA stores. This year I opted not to mark my old 14P as trade in to avoid the ordeal from last year.
 
I think you will get mixed response’s as some say they do have luck in doing this despite you have the trade in kit mailed to you.

It all depends who you talk to but it is wirth a shot.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.