OK, what if "he" reformat the computer right away. Lojack is useless then. You know what i mean? You can turn on the computer and do all that pre-reformatting stuff at a local coffee shop where you can get free internet. So, if "he" knows what he is doing, there is no way anyone can get his/her computer back.
Yes, then Lojack is useless.
However, there must be a way to track serial. I am very curious. Anyone?
No. OS X doesn't ever send the serial number over the internet. There is no way this is possible.