You're gonna file a damage claim right..??? You sent the guy a fully functional unit, it gets damaged. You're refunding his money, yet in the end you're the one left with a broken synth. I'd file a report.
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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.