Are we talking about a transaction in UK here
or some other English speaking country?
That might be academic as we are not discussing imperfect goods.
If you are buying a gift, it is always sensible to ask if it can be exchanged if it does not suit the recipient for some reason (i.e. it might be duplicating something they already own).
Another point is that it seems that you only know what you were told; did you hear the full exchange? The details of what people remember and recount might not be accurate.
I was with a friend when a fire alarm went off; we were not sure if it was a test, a drill or the real thing. We were on the first floor - my recollection was that we were told to stay in the building, her recollection was that we were told to stay on the first floor.
I have always been sure that my recollection is correct, but writing this has made me wonder if it was the other way round.