But, the truth here isn't that Apple denied repair. The owner should have made an appointment online. Anyone that has been to an Apple store realizes that an appointment is required by everyone. They are just too busy to handle things like this. The other problem is you will be getting a refurbished MBP when you exchange it via warranty. I just got my iPhone swapped out today... it looks like new but I know it's refurbished. It came out of plain box not off the shelf in a new box.
I really think you need to go back to the seller. He sold you the damaged product. I don't think Apple is responsible or liable. They didn't sell you the damaged product. AND, this is not a warranty issue. This could have happened by the reseller even though it doesn't seem like it to you. This again is the problem with resellers... they have nearly no care in the world once the transaction is complete. It will take one really great reseller to accept this return, plastic seal or not. I would love to know if that happens.
Please tell us how this turns out. I am very hopeful you get a BRAND NEW MBP. You paid for one and you deserve one, but you deserve it from the reseller and not Apple. They are not getting it in a sealed box and they don't know that you didn't drop it or bump it accidentally even with plastic on.
If it doesn't work out, it's a tiny very minor scratch. I have a bigger one on my MB that I bought brand new from Apple at the store the week it was released. It's not a ding but a surface scratch that is merely a place where the satin finish is missing and it's just shiny aluminum in the spot. I stomached it but it sucks! Just too lazy and excited to return it. I just wanted to get at it! A 30 minute drive to the Apple store (ok, 15 mins each way).
Best wishes.