Today I got not only four postcards but also a cover from Indonesia.
Endangered Birds (two from set of four) (issued 15-07-2012)
Inside were two cards from Indonesia showing the Tanah Lot Temple on Bali and a Wayang Kulit puppet play.
Also two Indonesian banknotes were contained in the cover.
And also a stamp pack was inside. See the stamps here.
Thank You very much Wildan!