I finally got around to opening my subscription shipment for Hook Mountain Massacre last night and didn't see the promo cards right away. It turns out they were stuffed into the box with the rest of the cards (as opposed to the box with all the styrofoam popcorn).
When I say stuffed... I'm being literal. The edges of the cards are damaged so much that I can't play with them.
I know Paizo doesn't offer replacement cards for cards that acquire wear and tear through play but what about cards damaged from shipping? I did some searches on the site but I didn't find any results.
You'd probably have a better response contacting customer service. You can post in their message board here: http://paizo.com/paizo/messageboards/paizo/customerService
I'm sure eventually one of the customer service reps would notice your thread, but you'd get a faster results putting it there yourself.
Hope you can get that replaced.