Bought rust before it was on steam. How do I access game or obtain steam key?

I bought Rust when the keys were being sold on the decreasing value auctions a while ago. Now I cannot find the in browser page that I used to use to play, has that been taken down? If so does buying it then translate into a steam key now, or do I have to buy it again on steam? Thank you all in advance.

(User was banned for this post ("Read the rules sticky before posting here. Use to get your steam key" - postal))