Steam key, and "original bought game"

Hello guys!

I bought “Rust” when it was on dutch auction for 45$ or so, went into some other games, and now i want to be back at Rust, but i noticed it’s on Steam now, how can i get it on Steam, if i bought it from the dutch auction a while ago?

Best regards Alex.

(User was banned for this post ("didn't read the sticky" - postal))
log in and get your steam key.

EDIT: Sorry, the link was not showing before, thank you.