Three current trades that are all multi item ones that are looking for offers. I wanna see more than just 1-2 completed trades for 2 keys, and a decent amount of them too. Also, as I said, as time progresses, only more will exist, collector prices will only go down over time, rarely or never up. Atleast the other two commenters have more proof, and even then they have 2 and 3 key sales, I'd say a good price is 2-3 keys or just 3 keys still.