any way to sell random steam keys?

maybe way to sell for sg?

Well, only if you get them through a purchasable chest, I reckon. Don't quote me on that, though

I got no idea

random keys that you never know it might not work.

not allowed to add a link here, Kinguin is a good one.

If you collected the reward, it will not be a random key anymore. You already have a key for a specific game and they are all not worth selling.

Just give it away like some people do. There are some highly interested idiots (only me) who like getting games just because they are free even if the game sucks.

I'd just give the key to a friend that may be interested in the game.