This guide is intended to help educate potential buyers and to illuminate some of the more misleading statements that are typically made in listings for skulls and skeletons. eBay allows the sale of "skulls and skeletons that are used for medical purposes."  In practice, you can find skulls in a wide variety of conditions, from professionally-prepared specimens to "found" skulls. Listing and buying skulls is a privilege here on eBay, not a right. If you want to buy responsibly, and if you want to avoid being taken advantage of by sellers who know that most people have never studied human anatomy, then this guide is for you.