Full disclosure up front - @SkOw is one of my favorite people on the boards. We've done a handful of great transactions, and he makes a concerted effort to buy my entire charity thread when holiday season rolls around.
That said, I think @BlackOut21 is clearly in the wrong here. The number of books sent out were not "a packed long box" as agreed to, and I trust the assertion that there were not X-men books included as expected per the pictures. In eBay speak - "Not as described." @SkOw - a small bit of advice though: don't make the unsatisfied customer comment until you have the refund check in hand (and by that point you might not feel the need to anymore). I understand the frustration in the moment, been there myself, but it seems to have dragged out the resolution to this particular issue as it caused the seller to rescind his refund offer.