Farm the stuff guys. Get a bunch of people together who are serious about farming for 6 hours of items that have a super rare drop rate and require you to visit at least 2 different places in order to get the fossilized bone and the fossilized fang, travel all the way to Bastok, then go to the BCNM and spam your tails at the guy and he's an easy win. If the people you got with you can't stick around for the BCNM then pick up someone who has a tail already, if they just go "inv me plz I need!" and they don't have the tail, they don't get invited because they're just being lazy bums who want to leech off everyone elses' hard work.

If you're in GMT increase 6 hours to 10 hours. :P