Removing sold device from find my mac
I have sold and given away 2 mac laptops. Now they both periodically show up in find my iPhone. I have tried removing device and each time I am told that if the device is turned on and find my mac is enabled it will come back into my list. At least I didn't hit erase to erase it from my list. The buyer would have been quite upset.
Both computers had the hard disk erased prior to sale, and a fresh copy of the OS installed.
That suggests that the MAC address is used to identify the machine. It should be possible to notify find my Mac that I no longer own the machine.
It may be important to turn off find my Mac before erasing hard drive and reinstalling the OS.
MacBook Pro with Retina display, OS X Mountain Lion (10.8.1)