Based on what I saw on the FAQs, it looks like anything prior to August 2012 will not be on the list. Here is a fragment from one of the questions. THE STRING "fastboot oem get_unlock_data" DOES NOT RETURN ANY DEVICE ID. WHY? The bootloader on Motorola devices released before August 2012 is not unlockable. This fastboot command will not return a device ID or unlock data for these Motorola devices. At this point, only the devices on our Supported Devices list are eligible for the unlockable bootloader program.