I think if you're happy with your phone you should keep it. We're all just trying to tell ya that 4.5 is not out yet.
Heck, I've sold BB's before and they look brand new. I always take care of the box, the manuals and CDs are never opened and remain in the shrink wrap, I don't use the case so it's always brand new...I don't even open up the charger box cause I've been using the same charger for awhile. So when I go to sell it, people are always amazed that I never really used anything other than the BB itself.
I think we're just trying to say that someone might have loaded 4.5 on their new BB, had problems with it and returned it. Then, you got it looked new to them so they just boxed it up.
But, again, if you're happy...I say congrats!