I agree with some of what Bob says above. Think about it, you know the guy screwed you over, so you won't be going back there right? So why worry about causing some grief to get what you should have gotten, and that's BOTH shocks covered under warranty. Call the customer service line, try not to get cranky with them, and they will check into it. Ask them about replacing 1 shock and how safe that is, and tell them the shock in question was completely dry, how was it supposed to be actively leaking at the time of repair.
Remember, you not going back, so just keep pestering them to try and get some resolution. I think you'll be surprised that you might get what you want.