Proof:

Thanks to [EGC] ♥Kittey♥ | Trade.tf for the screenshots

SALE#1:

http://www.tf2outpost.com/trade/26194313 (Sold for Aussie Wrench 24 Keys {24*.9= 21.6 round to 22 Keys}

http://i.imgur.com/MlMWpjT.png (Before and After) {the ref was traded for the secret saxton, and the other ref priced items}

SALE #2:

https://i.imgur.com/V9jS1Re.png?1 (Sold for Brown Bomber {Bubbling} 22 Keys and 2 Keys in "sweets") Mini at the bottom, going to update brown bomber after and add link (24 Keys*.9 = 21.6 round up to 22 Keys)

Mini on Bomber: (22 Keys)

Only http://i.imgur.com/kXgzkCX.png (23 Bumped 8 hours ago, 18 key is duped does not count)

No outposts or valid sales within the past 2 months