First. Pack the disassembled part into a cardboard box larger than the product being shipped. Place the foam / newspaper / bubble wrap fairly tightly between the cardboard and the part - so that the product is rigidly placed. This way let you to avoid every transport damages.
Secondly. In the same way, secure the top of the shipment. Thanks to this, you will reduce the probability of destroying parts during transport or while falling.
Third. We have to trust ourselfes happens situations when unprotected packages are opened and stolen. Address the package (waybill according to the instructions of the courier.