Any way to know what game Steam Key belongs to?

There isn't a way to find out what a key is.

BUT... if you already own two games and got the keys mixed up, you can try adding them to your account, then it will try to download the game associated with the key. That's how you can determine which is which. If you don't own the games though, you'll have used them.

If you bought "random keys" you're probably going to have to give them away as random keys, unfortunately.

Hello.

Adverting your social media is only allowed in giveaway descriptions. That's why I will close this thread.

If you remove part about your stream, and link to it - you can submit ticket in other category to unlock it.