They will have the Data when it was actually repaired by their Store. Notice How most of the Street Laptop Repair Store advertise with Apple repair? There is a whole Apple 2nd Hand, Repair economy out there. If they have an 3% repair rate on Apple Store, you can bet it is at least double that amount on total repair outside of Apple.

Which is one of the Key Point of Genius Bar, these front line Genius were suppose to Report back all sort of problems with their Product so the design team would know. Steve make sure this so they can services their customer better. Look at the Genius Bar now.