Run your fingers, with a piece of microfibre cloth or the cloth that you wipe your MBP with, on the surface of the top casing, do u feel a slight bump? I had....thought my refurbished is perfect. It's not visible unless I tilt it towards the light, and I noticed a very very slight dent. If I carefully feel it by smoothing it, I can feel that there's slight bump/dent. I just received my refurbished MBP, it's good overall...I don't think I should return it right? Sometimes, things are not always perfect.