They are Hasbro Asia exclusives but not all stores get them and some who did get them (at least here in HK) are selling them separately rather than giving them out with the Titan's Returns Figures. Most reputable HK stores however are giving them out when you buy TR figures.
There is a sheet for Wave 1 and another for Wave 2 so far.

As far as I am aware Hasbro AU doesn't get these so if you brought from a store like Target, K-Mart or Toys'R'Us odds on you won't get it. Even Toys'R'Us HK aren't giving them out this time around...