Glad it works! Yea next time if you have a choice ask for original box. It's possibly one of the best designed boxes on cardboard surrounding the SP20. They put some time/thought into it.
I haven't seen the boxes for the SP-20, but if it's anything like the ones for the SP-31/35, I would agree. Those boxes are awesome, perfect fit and sturdy as hell. I saved those for sure for if/when I need to ship mine out in the future.