Authorized or not, bottom line is that if this guy is selling US models, and taking the power supply out and charging people for that, I'm almost certain this isn't legal. Someone should check this guy out, or better yet call Yamaha and let them do it.
Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.