Do a search you'll find lost of info as this has been discussed extensively.
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You may want to put some additional styrofoam material inside the box. It can be bought in a 4' x 8', it comes in deifferent thickness. Additionaly you can put shock sensors
and/or tilt sensors to the outside of the boxes, that way the buyer will be able to notify the shipper of rough handling to the boxes. Hope this will help. Hector.