how recent did you purchase it?
I know outlets are a bit more hectic so it would be difficult to look at the receipts, and they can't just go with what your cc statement says because all it states is the price and day but not what it's for and you could have ( in theory ) made multiple purchases that day
the price couldn't have changed so much (I hope) so it doesn't hurt to go in and ask! the sooner is definitely the better