Sale 1:

Sold for 34 keys + ~1 key in items

http://www.tf2outpost.com/trade/27762642 - No B/O

Seller: http://backpack.tf/profiles/76561198104779652#!/compare/1454313600/1454400000

Buyer: http://backpack.tf/profiles/76561198075169572#!/compare/1454400000/1456041600

Was used in the last suggestion, still barely valid

https://i.gyazo.com/17d360e8e82d94b83b9e82540ee1959d.png - credit to SV.

X = 35

Sale 2:

Sold for 32 keys

http://www.tf2outpost.com/trade/28081041 - B/O of 35, buyer offers on trade

Seller: http://backpack.tf/profiles/76561198031350787#!/compare/1461110400/1461196800

Buyer: http://backpack.tf/profiles/76561198067464803#!/compare/1460937600/1461196800

X = 32

Sale 3:

Sold for 32 keys (According to item histories)

http://www.tf2outpost.com/trade/28048226 - B/O of 40

Seller: http://backpack.tf/profiles/76561198046028502#!/compare/1460073600/1460160000

Buyer: http://backpack.tf/profiles/76561198055415266#!/compare/1459814400/1460160000

X = 32

Sale 4: (Dupe)

Sold for 16 keys + Pro. KS Frontier Justice + 7 keys in items

http://www.tf2outpost.com/trade/28072625 - B/O of 35

Seller: http://backpack.tf/profiles/76561198025486280#!/compare/1461024000/1461196800

Buyer: http://backpack.tf/profiles/76561198180722009#!/compare/1460246400/1461196800

http://puu.sh/oyDuK/46df091a01.jpg

http://puu.sh/oyDva/85d0626d72.jpg

Frontier Justice Sold for 14 keys:

http://puu.sh/oyDtu/60eb5f18a6.jpg

http://puu.sh/oyDtu/60eb5f18a6.jpg

Sellers at 13 keys

Going with 13-14 for frontier justice

X = 16 + 13.5 + 7

X = 35 (Capped by B/O)

And who says dupes lower the value of a hat? :P

Sale 5:

Sold for Duped Frostbite Bot Dogger

Seller: http://backpack.tf/profiles/76561198031405199#!/compare/1457078400/1457424000

Buyer: http://backpack.tf/profiles/76561198074924284#!/compare/1457078400/1457424000

Not using due to bot dogger shenanigans

Sale 6:

Bulk for Searing Hat with No Name

Seller: http://backpack.tf/profiles/76561198013121180#!/compare/1460678400/1460764800

Buyer: http://backpack.tf/profiles/76561198031350787#!/compare/1460678400/1460764800

Sale 7:

Sold for Stare From Beyond Gym Rat + Strange Spec. KS Degreaser w/ parts

Seller: http://backpack.tf/profiles/76561198055415266#!/compare/1460419200/1460505600

Buyer: http://backpack.tf/profiles/76561198013121180#!/compare/1460332800/1460505600

Gym rat is unpriced, should be used to price it instead

Sellers:

40 keys:

http://puu.sh/oyDCe/bbfbc3aa14.png - 4 months

http://www.tf2outpost.com/trade/28094215 - 1 week

Sales at:

32

32

35

35

Going with 32-35