>>6807227You've got to get an untouched case (12 figures still sealed or packaged). Otherwise good chance you got ripped off. A 1/36 is two per every six cases, and a 1/72 is one per every six cases. You'll get either a 1/36 and 1/72 of those per case (if it's untouched).
If you get 12 completely random figures, then you may get no rares or up to two, you never know. Odds are you'll probably get none though if it's 'random'.