The Souls of those Headshotted

http://backpack.tf/item/3341756018

Sale 1) Sold for a Professional Killstreak Max's Severed Head (60 Keys)

http://backpack.tf/profiles/76561198090078603/#!/compare/1455523200/1456819200

http://www.tf2outpost.com/trade/27732612 - Capped by the Buyout of 52 Keys

Max's Severed Head Mini

http://steamcommunity.com/market/listings/440/Professional%20Killstreak%20Max%27s%20Severed%20Head

Using the 2 Sales around the time of the sale ($112.41 and $208.31), which average to $160.36

160.36 / 2.5 = 64 Keys

106.36 / 1.15 / 2.5 = 56 Keys

Using 60 Keys for the Max's Severed Head

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Sale 2) Sold for a Burning Flames Platinum Pickelhaube

http://backpack.tf/profiles/76561197982127154/#!/compare/1457938800/1458025200

Using this for the Pickelhaube

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Sale 3) Quicksold for 40 Keys

http://backpack.tf/profiles/76561198102772694/#!/compare/1458111600/1458198000

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Sale 4) Sold for a Hot Professional Killstreak Lightning Rod Shotgun (Field-Tested)

http://backpack.tf/profiles/76561198043536092/#!/compare/1458777600/1458950400

I'd rather not search for a Mini for this, but if needed, then I'll look for one.

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Sale 5) Bulk Sale

http://backpack.tf/profiles/76561198111273937/#!/compare/1459555200/1459641600

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Sale 6) Sold for a Stormy Storm Anger + 10 Keys

http://backpack.tf/profiles/76561198048120191/#!/compare/1459728000/1459987200

http://www.tf2outpost.com/trade/28038813 - Capped by the Buyout of 35 Keys. Calling this Sale an Outlier because of Sale 3

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Sale 7) Sold for a Haunted Ghosts Sober Stuntman + Dead Presidents Armored Authority + 4 Keys of Items

http://backpack.tf/profiles/76561198072147319/#!/compare/1460160000/1460246400

53 + 4 = 57 Keys

Sober and Armored Mini

Both sold for a Morning Glory Madame Dixie (42) + Strange Professional Killstreak Huntsman (9 Keys) + 2 Keys

http://backpack.tf/profiles/76561198072147319/#!/compare/1460332800/1460419200

Madame Dixie Micro

http://backpack.tf/vote/id/5712a4178667471e784a99f4 - 42 Keys

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Sale 8) Sold + Multiple Keys of Sweets for a Morning Glory Ground Control

http://backpack.tf/profiles/76561198094737736/#!/compare/1460505600/1460592000

Using this to price the Ground Control.