How can I recover the remote wipe PIN code for my Mac?

Jeff's Mac got stolen and he used Find My Mac to get it back. Meanwhile he used the remote wipe to wipe it. How can he get his data back? Leo says that Apple did a great thing with a system lock and remote wipe. But how does he get his system lock pin code? Leo says Jeff needs to call AppleCare and he'll probably have to bring it into an Apple Store to fix.