Hi, Apple is going to replace the bottom case of my MacBook Pro. They said that the new case will not have a serial number. I guess if I try to sell the laptop to a store later, they may ask and reduce the selling value of the computer. Besides that, do I have to care about a lack of serial number at the bottom of the case? Why can't apple just engrave the serial number to the replacement case the way they do to the new iPod?