I bought a used digital piano a couple of years ago that came in a professionally designed and built hard shell case made specifically for this item and it arrived safely. I re-sold it recently, paid nearly $200 to ship it, and it arrived to the buyer damaged beyond repair.
The latches to the case had several layers of packing tape going around the case to prevent accidental opening. They denied my claim for damages and cited "insufficient packaging" and noted the case was not damaged. When I got the item back from UPS it was plain as day that the case was in fact significantly damaged and had obviously been dropped from a significant height.
I will never ship with UPS again as long as I live. Avoid them.