I've had about 5 guitars shipped to me with no case (guitars shipped with soft cases generally do not come *in* them, and Scandal's guitars are no exception) - all came through perfectly.
I've had one guitar shipped to me in a hard case and it came to me damaged. The dealer had tried to put the receipt through the strings, it slipped out in transit, got stuck underneath the guitar and the staple in the receipt rubbed all over the back of the guitar, scratching the entire back and actually denting the body in several places. That could not have happened if not for the hard case.
So neither method is inherently better than the other. I'd just ship the guitar as it is. Two of my three Scandal guitars were shipped only in their Squier boxes, and they were actually shipped twice before I opened them, and they were fine.