Not-mint condition generally refers to items that are "retail store quality" and may have bent, damaged, or creased packaging. The product itself is in perfect condition, unless otherwise noted. So, if you like to play with your stuff instead of keeping it in pristine packaging, the items we sell that are not in mint condition are a great way to get a small discount.
Also, any time we cannot sell a complete set because some of the items in the set are not in mint condition, the individual items will be offered as "Not Mint" items. This is an excellent opportunity to buy individual figures or other items that we normally sell only in sets or full casepacks.