Click [url=http://i.imgur.com/zNVQrxJ.jpg]HERE[/url] for proof.
So as you can see, I was able to pre-purchase TTK. I did so digitally on my XBOX 360 despite many sources saying that was not possible. Yet I did not get my Suros pack. The DLC itself works just fine, but no Suros pack in sight.
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Thanks for posting the last four digits of your credit card on a public forum :-) In other news, did you check the Vanguard Quartermaster? You have to buy the SUROS weapons from him.