tail im pretty sure is in the bandit camp when your sneaking around before the scar bossfight. if youve already beat scar then try looking around the camp or asking jester where it is.
oh. You get it by waiting until day 20 unless bernard is still sick then you have to get the cure from the lizards in the temple and once you cure bernard if it's past day 20 you need to speak with him wait a day come back the town is in ruins and then you get the camp unlocked.