Sorry to necro an old thread here, though not by too much. For future reference, never ship a system like you're describing assembled. Pull the drives and pack them individually first, and then box as needed. I've had indestructible things like power supplies and SSDs destroyed while shipping systems (in the past, lessons learned), and even crazy things like good Corsair fans falling off their motors. That either takes serious impact, or days of terrible vibration. Maybe plenty of both.