I believe at this time that all Nepal codes have been sent out. If you're 100% positive you're using the correct email address that purchased the shirt in the first place. You'll need to check your Inbox and Junk folder. If you can't find it, I'm afraid there's nothing more anyone can do.
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I've checked all my e-mails. No e-mail about the code on or around 8/19/15 when they were released. This is like the blacksmith Shader ordeal all over again... I have that on Ps3 but it doesn't work on Ps4.