"It seems to me that permanent marker does not just rub off that easily, no matter how much work you put into it. I think that some jackass Microsoft repair monkey put a little bit of black ink on a new case, just to make it appear that the old signatures were rubbed off. I would bet money that whoever did that took the signed case and has it at home. I also wouldn’t be surprised to see that case on eBay, knowing the intelligence level of the Microsoft repair center employees first-hand."