Good for him. If he gets away with eBay's ignorance, more power to him. He may very well know what his odds are of getting it through.
My buddy bought an Enfield "barrel" on eBay. It was pictured with the receiver, but he naturally expected that not to come with it. But it did! So instead of getting a barrel to restore an old Enfield, he got another Enfield that needed to be restored.