Close. Not close enough though.

Sale 1: Sold for 20 keys

http://backpack.tf/profiles/76561198060060658/#!/compare/1457856000/1458284400

Sale 2: Sold for Orbiting Fire Copper's Hard Top[11 keys via mini]+Genuine Specialized Killstreak AWPer Hand[2 keys]+Taunt: The Killer Solo[1 key]+Genuine Shred Alert[1.7 keys]+The C.A.P.P.E.R[1.85 keys]+Strange Professional Killstreak Fists[1.7 keys via mini]+Strange Professional Killstreak Kukri[2.3 keys via mini]

http://www.tf2outpost.com/trade/27868563 b/o was 15 keys

http://backpack.tf/profiles/76561198230837320/#!/compare/1455868800/1455955200

11+2+1+1.7+1.85+1.7+2.3=21.55 rounding to 22 keys

b/o was 15, capping it there.

Sale 3: Sold for 17 keys

http://backpack.tf/profiles/76561198191394557/#!/compare/1455350400/1455436800

Mini on Awper Hand:

Sellers at 2 keys https://gyazo.com/da1ce60c2a1954e57a453d2f08ca654c.png

Mini on Fists:

Seller at 1.7 keys https://gyazo.com/32c767061b871013555429b4cb76bcd3.png

Mini on Kukri:

Sellers at 2.3 keys https://gyazo.com/8c61e7c03ecceffd10328b1ebea76777.png

Mini on Copper: http://backpack.tf/vote/id/56fc812083de6b1b0a78eeb7

So I have sales at 15, 17 and 20. Making this a range of 15-20 keys.