My MacBook air was stolen from my apartment a few days ago. I got the address on the find my iPhone app, but then it said that the MacBook was locked, requiring a code. I didn't lock my MacBook from find my iPhone, and when I spoke to the Apple store they told me that it was probably locked because of the thief entering the wrong password too many times.
My question is: can the thief still use my MacBook? Can they delete the HD when it's locked and when I have a password on it?