Sale #1 (January 22nd):

Crown > Kill-a-Watt Sergeant’s Drill Hat (1.85)

Outpost trades:

Drill: http://www.tf2outpost.com/trade/24745421

Histories:

Drill: http://backpack.tf/item/2007724947

Crown: http://backpack.tf/item/2935597222

1.85 * 0.9 = 1.665 = 1.7

1.7

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Sale #2 (December 29th):

Crown > Blizzardy Storm Familiar Fez (1.2) + 1 bud

Buyer's Inventory:

http://backpack.tf/profiles/76561198059076662?time=1419753600 -> http://backpack.tf/profiles/76561198059076662?time=1419840000

1.2 * 0.9 = 1.08

1 + 1.08 = 2.08 = 2.1

2.1

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Sale #3 (December 20th):

Crown + Miami Nights Soldier's Slope Scopers (2) > Sulphurous Vintage Merryweather (3.9)

Outpost trades:

Merryweather: http://www.tf2outpost.com/trade/24233501

Crown + Scopers: http://www.tf2outpost.com/trade/24186475

Buyer's Inventory:

http://backpack.tf/profiles/76561198051995072?time=1419062400 -> http://backpack.tf/profiles/76561198051995072?time=1419148800

3.9 * 0.9 = 3.5 - 2 = 1.5

1.5

Complex sale—probable outlier

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Minis:

Blizzardy Storm Familiar Fez Sale (December 10th):

Fez > Orbiting Planets Cosa Nostra Cap (18 keys)

Seller's Inventory:

http://backpack.tf/profiles/76561198127428236?time=1418198400 -> http://backpack.tf/profiles/76561198127428236?time=1418284800

18 * 0.9 = 16.2

Buds = 13.25 keys

16.2 / 13.25 = 1.22 = ~1.2

1.2

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Miami Nights Soldier's Slope Scopers Sale (January 24th):

Scopers > 28 keys

Outpost trades:

Scopers: http://www.tf2outpost.com/trade/24190314 (confirmed 28 keys in the comments)

Buyer's Inventory:

http://backpack.tf/profiles/76561198142245479?time=1422086400 -> http://backpack.tf/profiles/76561198142245479?time=1422172800

Buds = 14 keys

28 / 14 = 2

2