I just sold a burning shadows booster box on eBay.
I had planned on using medium flat rate boxes. However, they seem too roomy for a single box. I am worried it will bounce around.
Anyone recommend packaging to ship a single booster box?
Thanks
Z
Fill the extra space with packing paper or bubble wrap so it won’t move around. You should always know how you plan on shipping an item before you make a listing. 
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Wrap the booster box in bubble wrap then packing peanuts all around and you’ll be good to go. That’s how I received and then shipped my Red Logo Fossil box safely from and to the U.S. Add another small box around the bubble wrap and between the packing peanuts if you want to be meticulous.
What others have said is correct, but I want to offer some alternatives. I definitely recommend wrapping the box in bubble wrap to protect it (especially the corners). Packing peanuts are nice, but if you want to save some money, ball up junk mail or other paper you have lying around. The key is to make sure the box can’t move around, because if it bounces around inside the packaging, it can be damaged in transit.
If it fits use a regional rate size A box. It will be cheaper than medium flat rate almost always. You can order them on USPS website for free
Modern booster boxes fit perfectly in empty ETB boxes. I’ve shipped a couple dozen this way in the past with no issues. Fill the gaps with bubble wrap and wrap the box in packaging paper.
Take the packs out and throw them in a small flat rate box. One less step for the buyer. Too easy.
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