Sale 1:

Sold for 15 keys

No outpost link available

Seller: http://backpack.tf/profiles/76561198045654523/#!/compare/1455955200/1457164800

Buyer: http://backpack.tf/profiles/76561198048610662/#!/compare/1455868800/1455955200

X = 15

Sale 2:

Sold for 15 keys

No outpost link available

Seller: http://backpack.tf/profiles/76561198048610662/#!/compare/1455955200/1456300800

Buyer: http://backpack.tf/profiles/76561198092295228/#!/compare/1456041600/1456214400

X = 15

Sale 3:

Sold for Spec. KS Aussie Black Box (with expensive parts) + 2 keys

http://www.tf2outpost.com/trade/27786742 - B/O of 24

Seller: http://backpack.tf/profiles/76561198145082209/#!/compare/1455436800/1455523200

Buyer: http://backpack.tf/profiles/76561198045654523/#!/compare/1455264000/1455523200

X = 20 + 2

X = 22

Sale 4:

Sold for Cloud 9 Snaggle + Uncraft. Black Paint

http://www.tf2outpost.com/trade/27889301 - B/O of 22

Seller: http://backpack.tf/profiles/76561198092295228/#!/compare/1456387200/1456473600

Buyer: http://backpack.tf/profiles/76561198106841415/#!/compare/1456387200/1456473600

X = 22 + 1

X = 23

Capped by B/O of 22

Sale 5:

Sold for Dead Presidents Sammy Cap + Strange Archer’s Groundings

No outpost link available

Seller: http://backpack.tf/profiles/76561198095223890/#!/compare/1454140800/1454227200

Buyer: http://backpack.tf/profiles/76561198145082209/#!/compare/1454140800/1454227200

X = 14 + 1.8

X = 15.8

Rounding to 16

Sale 6:

Sold with 6 uncraftable black/white paints for Smoking El Jefe

No outpost link available

Seller: http://backpack.tf/profiles/76561198106841415/#!/compare/1456473600/1456560000

Buyer: http://backpack.tf/profiles/76561197976620258/#!/compare/1456387200/1456646400

X + 6 = 18.5

X = 12.5

Rounding to 13

Sellers:

25 keys:

http://puu.sh/o5hHM/928ab65baf.png - young

Sales at:

13

15 (pure)

15 (pure)

16

22 (australium)

22

13 key sale happened in less than a day, and wasn’t even listed on outpost. Therefore, excluding 13.

Going with 15-22