At the moment, there's no fansite or source that indicates how to obtain the Badger Fur (Item). Tibia Fandom indicates it's unobtainable and that it got implemented in version 8.1 on Dec 11, 2007. So the update can either be related to how to obtain the item or it's simply unobtainable which many believe. I always thought that maybe we could trade Badger Furs with Irmana but that didn't work for me at least. Sometimes items that appear in the Cyclopedia aren't implemented for years if ever, according to this related TibiaQA question, Do all the market items exist within the game?