I'm having the same issue and just submitted a similar ticket. Provided my proof of purchase receipt, the game was sealed from my retailer, and there was only the Phantom Edition code inside. I did not see a code anywhere for the Tombstone pack, it was one of the big reasons why I wanted to pre-order it as I was a big BF4 campaign fan. Disappointed I have not received it, and there appears there is no other way to get it. I have successfully received all other rewards including the Beta rewards, Road to BF6 and the Twitch drops.
Sounds like I'm in the same boat as you, legit I only wanted the Pac skin as BF4 is one of my all time favourites.
