I had an issue returning a macbook to a major electronics store chain within the 14 day right to return law (EU). The returns person and their manager said it wasn't possible to return it because after signing in with an Apple ID when you turn it on it gets "locked" to that ID or whatever. Fortunately there was another store in the city I had to travel to for appointment on the same day and they just took it back and gave me a refund. I hope the person there didn't get in trouble..