You can buy edge and corner protectors, I'd start there. You'll need a big box that probably won't fit perfectly but you could cut cardboard pieces to fill in gaps.
16 Foam Corner Protectors for Shipping Protection Storage & Careful Packaging | eBay
Vestil 24 in. Cargo Edge Protector-CEP-24-W - The Home Depot
16 Foam Corner Protectors for Shipping Protection Storage & Careful Packaging | eBay
Vestil 24 in. Cargo Edge Protector-CEP-24-W - The Home Depot