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You can get the Gold box supply as a mission reward if your rank is Warrant Officer 1 or above. But those missions are very rare to get.

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Guys see the end of each week rewards when you get extra supplyes and crystals if you do a dailey mission evary day , if gold boxes are supplyes why didint i get any at the end of the week?

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I agree with you im on Silver5 for the mission badge :/ and i havent even got gold ...

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For now you can get Gold box supply only from daily missions itself, it's not available as a gift for completing the mission chains. This comes from a special status of this particular supply that hugely differs from others.
Customer support service by UserEcho
You can get the Gold box supply as a mission reward if your rank is Warrant Officer 1 or above. But those missions are very rare to get.