I'm betting the card fell out when people inspected the box, or it's possible that someone popped the box open and grabbed the card.
Either way I doubt it was a mispack and will have to order a replacement from PP, I'm just dreading it. The last order I made took 5 weeks for a card and an upgrade blister pack. I had a t-shirt on order but it never showed up, and I was so fed up that I just decided to take the $16 loss and not keep fighting over stuff not arriving.