I just looted these slippers off of a Lessor (or Minor) Werewolf in WC today. So at least once a year they have a chance of dropping during the Halloween events.
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Gesibe DelCorvino Falcons of Norrath Bristlebane (Formerly of Solusek Ro)
got these off the Werewolf Overloard in WC. Was a pretty cool fight. He coned blue to a lvl 47 (me) but he had a crap load of HP. Also he didnt hit hard at all. Other lewts off em was the Paladin Crown.