Hmm, my package also had no scratch cards in it. I submitted a ticket and they sent me new ones back in December. But looking at the box, I wonder if they fell out. There was only tape down the middle seam, and that left some holes. My invoice was half under one of the flaps in the box, so if the tickets were with it, depending on their size, they could have slipped out.
With a bunch of people who didn't get them, I wonder if that happened (Or it was a ticket gnome who took them).