So this PC game came with two codes in the box...

I picked up a Sims 4 expansion pack on sale at Target recently. Inside, there's two sheets each with a different product key. The sheets look the same; both seem to be for the full expansion. (It's not like buying a game where one code is the game and another is for bundled DLC.)

I redeemed one code. Where/how should I sell the other. I don't really sell/trade games. And if for some reason that second code doesn't work, I'd want to refund the buyer without losing money on the whole deal (transaction fees).

Suggestions?

Here's a pretty good place to give that a shot,

https://www.cheapassgamer.com/topic/327125-steamorigindesura-etc-buyselltrade-thread-read-the-op-one-post-every-three-days/page-1532

and it's one of the more active forums, so you should get some takers.