Sale 1:

Sold for Max’s Head (19)

http://www.tf2outpost.com/trade/29328964 - B/O of 17

Seller: https://backpack.tf/profiles/76561198159855421#!/compare/1509321600/1509408000

Buyer: https://backpack.tf/profiles/76561198289862989#!/compare/1509408000/1509494400

X = 17 (Capped by B/O)

Sale 2:

Sold for 16 keys

Seller: https://backpack.tf/profiles/76561198069813252#!/compare/1509667200/1509840000

Buyer: https://backpack.tf/profiles/76561198371106215#!/compare/1509753600/1509840000

X = 16

Sale 3:

Quicksold for 15 keys

Seller: https://backpack.tf/profiles/76561198394823128#!/compare/1510185600/1510272000

Buyer: https://backpack.tf/profiles/76561198161481285#!/compare/1510185600/1510272000

X = 15

Sale 4:

Quicksold for 15 keys

Seller: https://backpack.tf/profiles/76561198087784600#!/compare/1510704000/1510790400

Buyer: https://backpack.tf/profiles/76561198300711587#!/compare/1510704000/1510790400

X = 15

Sale 5:

Quicksold for 12 keys + some metal

Seller: https://backpack.tf/profiles/76561198128838220#!/compare/1509926400/1510012800

Buyer: https://backpack.tf/profiles/76561198127938353#!/compare/1509926400/1510012800

X = 12

Sale 6:

Sold with 5 keys for ’72 Posedown

Seller: https://backpack.tf/profiles/76561198371106215#!/compare/1509840000/1509926400

Buyer: https://backpack.tf/profiles/76561198128838220#!/compare/1509753600/1509926400

Should be used on the Posedown.

Sales at:

12

15 (2x)

16

17

12 and 15 quicksold, excluding them.

Going with 16-17.