Lets update this.

Sale 1: Sold for Disco Beat Down Wraith Wrap[outdated at 37.5 keys]

http://backpack.tf/profiles/76561198075678974/#!/compare/1456646400/1456992000

37.5 rounding to 38.

Sale 2: Sold for Circling Heart Pirate Bandana[70 keys via mini]+ Collector's Professional Killstreak Original[20 keys~]

http://www.tf2outpost.com/trade/27431029 b/o was 60

http://backpack.tf/profiles/76561198075678974/#!/compare/1454659200/1455868800

70+20=90 but b/o was 60 so ill cap it at that.

There's also been an offer of 45 keys pure.

http://www.tf2outpost.com/trade/27431029 https://gyazo.com/53e3c7eac7b74a516e49796cbacc94e7.png

Mini on Bandana: Seller at 70 keys

https://gyazo.com/3f3bf8a0fa24349626178af3948aa1d2.png

Mini on Wraith Wrap: Couldn't find any.

There's no available mini on the Wraith Wrap, so the only valid sale is sale #2. There has also been an offer of 45 keys pure, which was declined. Due to this offer, I'll say that 38 is the outlier here, and update this at 60 keys.