Apparently there's a limit of one adapter per device you own, so I guess they track which devices have already been "used." http://www.apple.com/support/usbada

Apparently there's a limit of one adapter per device you own, so I guess they track which devices have already been "used." http://www.apple.com/support/usbadapter-takeback/ http://www.apple.com/support/usbadapter-takeback/