It is recommended that your cluster be wrapped in bubble wrap and then placed in  box with at least 2" of clearance on all sides to leave room for more packaging material to FILL UP the empty space and prevent damage to your cluster.
To fill up the empty space in the box you may use bubble wrap, newspaper or peanuts but please DO NOT place your cluster directly into shredded paper or in packaging peanuts as they carry static electricity which can cause damage to sensitive electronics from static discharge.
Inside of the box should be your repair order form with all of your information, otherwise there could be a delay in processing your order if we don't know who the part belongs to or what it was sent in for.
Also, the box should be taped up well and addresses clearly marked.