I just got a quote on my own boxes, 1 bigger than their large box they quoted $730, and 4 much smaller boxes they quoted 717 each. Im just gonna stick everything into their large boxes.In my shipment I added 4 of my own boxes which are the same size as HK post office M4box = 73 x 55 x 46cm boxes. I paid extra 1K HKD per each box in my shipment.
You can buy and add your own box to the shipment, off course its going to be different cost, more expensive then using their boxes. have a play around on SS website for quotes, its quite good and accurate.