I'm in no rush, so I opened the Phase 1 pack of Chaos Legion just today. I had only one voucher - so there was only one pack. And that's what fortune brought me:
I am convinced that I did the right thing, that I did not sell the voucher, but used it for its intended purpose. According to a very rough estimate, these cards cost about $100. Two gold cards, who would have thought!
I haven't decided what to do with it yet. But I will probably sell, because my main goal is staking of SPS.