Team Fortress 2
Counter-Strike: Global Offensive
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-Sold with a sulph big chief + ~4 keys in sweets (though this does seem very high): http://backpack.tf/profiles/76561198116082946#!/compare/1487548800/1487894400
-Sold with 7 keys for a vivid noir: http://backpack.tf/profiles/76561198130990555#!/compare/1488153600/1488240000
There are probably more sales in this very history, I can help you look through it later if you'd like but 18 might not be right: http://backpack.tf/item/4954568502
i remmember going through those sales and we didnt use it for some reason i dont remember
Sold for $42 ( / $2,10 ) = 20 keys
http://www.tf2outpost.com/trade/28797515 - reselling with 22 key b/o
Taking from Fish above, he sold it for the Sulphurous Big Chief + 4 keys in sweets. He was reselling it with a 22 key b/o means that he didn't value it at 28+ himself either.
Mini for the Noir:
Sold for $47,50 ( / $2,10 ) = 22,6 keys = 23 keys.
22 keys (noir)
18 flat is definitely not going to correct. I'd go with 17-22 based on the sales, although the Noir might need a bit more digging. You can make a suggestion on that as well if you'd like.
Closing on account of sufficient counter-evidence. Feel free to fix.