Which file (or .plist) contains the info found in the About This Mac window?

I do believe it reads the serial number off the mother board.

Lightstrife wrote:

I am looking specifically for the serial number belonging to a Mac Air. The computer is no longer in my possession, I only have the hard drive. And please do not infer that I am doing something nefarious - I am not. Thanks for your time.

You need the actual computer to get the serial number.

Cheers

Pete