This looks like the tell tale sign of a Macbook Pro being opened, while there is something touching behind it.
I have done this to two of mine and it takes almost NO effort. If the laptop was opened even an inch, it will offset the screen. There will be no obvious damage or marks, because the hinges on the inside, are what take the hit. If you do it hard enough, you can get the plastic to crack.
If it was dropped or pushed by any part of the aluminum, there would be visible damage. This has to had been done by opening the lid with something behind it. It basically wedges the object and causes the weakest parts (inner hinges) to bend, or move.
This can be fixed easily by ordering the hinges and a new black rear cover. Once you replace them, it will be inline.