If that's the same as Humble Tropico 3 campaign, your copies are just a bunch of useless links. The links will be expired as well.
And yes, Steamtrades is your place.
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Besides, I'm giving extras away for free so why would anyone trade with you.
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Well, if so, you're in luck. I made sure to get extra copies. :) If you'd like one, I'd love to make a trade for any games/cards/keys you have lying around. Message offers to my Steam account :)
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