Sale 1:

Sold for $30 on Marketplace.tf

https://marketplace.tf/items/344;5;u6

Buyer: https://backpack.tf/profiles/76561198125261443#!/compare/1490400000/1494979200

https://backpack.tf/item/4399319604

30/2.1 = ~14.3

X = 14

Sale 2:

Sold for Insomnia Bandito (13) + 2 keys + ~1 key in items

http://www.tf2outpost.com/trade/29239280 - B/O of 13, seller confirms sale (legend)

Seller: https://backpack.tf/profiles/76561198024925599#!/compare/1498262400/1498348800

Buyer: https://backpack.tf/profiles/76561198139189194#!/compare/1498262400/1498348800

X = 13 (Capped by B/O)

Sale 3:

Sold for Steaming Ye Oiled Baker Boy (13)

http://webcache.googleusercontent.com/search?q=cache:qaWkUOniO-IJ:www.tf2outpost.com/trade/28867739+&cd=1&hl=en&ct=clnk&gl=au – B/O of 13

Seller: https://backpack.tf/profiles/76561198050062763#!/compare/1491696000/1491782400

Buyer: https://backpack.tf/profiles/76561198060920300#!/compare/1491696000/1491782400

X = 13 (Capped by B/O)

Sale 4:

Sold for 11 keys in ~4 days

http://www.tf2outpost.com/trade/29229452 - B/O of 13, listed for 1 day on outpost

Seller: https://backpack.tf/profiles/76561198071365493#!/compare/1497225600/1497484800

Buyer: https://backpack.tf/profiles/76561198056804245#!/compare/1497312000/1497484800

X = 11

Sale 5:

Bulk for Burning Stout Shako

Seller: https://backpack.tf/profiles/76561198196962255#!/compare/1496188800/1496275200

Buyer: https://backpack.tf/profiles/76561198317146471#!/compare/1496016000/1496275200

Sale 6:

Bulk for Bubbling KE

Seller: https://backpack.tf/profiles/76561198056804245#!/compare/1497657600/1498003200

Buyer: https://backpack.tf/profiles/76561198024925599#!/compare/1497916800/1498003200

Should be used on the KE.

Sale 7:

Sold for Aces High Sola Topi + ~2 keys in items

http://www.tf2outpost.com/trade/28852461 - B/O of 13

Seller: https://backpack.tf/profiles/76561198301244249#!/compare/1490832000/1490918400

Buyer: https://backpack.tf/profiles/76561198194251763#!/compare/1490313600/1491523200

No usable sales on the Topi. Should be used on it instead.

Sale 8:

Sold with Spec. KS Aussie SMG for Smoking Airdog

Seller: https://backpack.tf/profiles/76561198060920300#!/compare/1492905600/1493337600

Buyer: https://backpack.tf/profiles/76561198066963919#!/compare/1493251200/1493337600

Should not be used here, would end up being too low anyways.

Sale 9:

Sold for a lot of metal/items

Seller: https://backpack.tf/profiles/76561198156215703#!/compare/1493337600/1493424000

Buyer: https://backpack.tf/profiles/76561198127055586#!/compare/1493337600/1493424000

Should not be used to get an exact figure out of this sale.

Sale 10:

Quicksold for 11 keys and a couple ref probably

Seller: https://backpack.tf/profiles/76561198205939253#!/compare/1498435200/1498521600

Buyer: https://backpack.tf/profiles/76561198128838220#!/compare/1498435200/1498521600

Sellers:

14 keys:

http://i.imgur.com/WpexXY0.png

https://backpack.tf/u/76561198139189194

http://www.tf2outpost.com/trade/29244359 - 2 days

http://i.imgur.com/jwU5F0F.png - 3 days, probably lowered/re-listed

https://backpack.tf/u/76561197964171516

http://www.tf2outpost.com/trade/29233431

http://i.imgur.com/ETpsZFd.png - young

https://backpack.tf/u/76561198128838220

Sales at:

11

13 (2x)

14

Sale(s) at 11 quicksold, and are countered by quickbuyers:

http://i.imgur.com/FrkftfM.png

Excluding 11.

Going with 13-14.