Much sales.

sale 1

http://backpack.tf/profiles/76561198278474165#!/compare/1462406400/1462492800 - unclear

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sale 2

http://backpack.tf/profiles/76561198278474165#!/compare/1461974400/1462060800

http://www.tf2outpost.com/trade/28118136

Sold with 1 pure for a Hot Killstreak Aqua Marine Rocket Launcher (Minimal Wear)

Mini on RL

http://backpack.tf/profiles/76561198119391986#!/compare/1462060800/1462233600 - Sold for ~3 in sweets + DBD outta sight (40)

x+1=43

x=42

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sale 3

http://backpack.tf/profiles/76561198204215085#!/compare/1461542400/1461715200

http://www.tf2outpost.com/trade/28103168 - b/o 12

sold for 11 pure

x=11

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sale 4

http://backpack.tf/profiles/76561198254180938#!/compare/1462060800/1462147200

http://www.tf2outpost.com/trade/28128835 - b/o 12

1:1 with a terror billy

mini on TW billy:

http://backpack.tf/suggestion/57340b4f83de6b0ab84dfcf3 - 18

x=12 (capped by b/o)

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sale 5

http://backpack.tf/profiles/76561198254180938#!/compare/1461974400/1462060800 - unclear

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sale 6

http://backpack.tf/profiles/76561198071859271#!/compare/1460851200/1460937600

TW steel toe (12)

mini on toe:

http://puu.sh/oP6p9/98ba2a54ac.png - 12

x=12

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sale 7

http://backpack.tf/profiles/76561198071859271#!/compare/1460678400/1460764800

1:1 with a Collectors pro ks degreaser

Mini on degreaser

http://steamcommunity.com/market/listings/440/Collector%27s%20Professional%20Killstreak%20Degreaser

Last sold for $36.45 (15 keys)

x=15

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sale 8

http://backpack.tf/profiles/76561198074726834#!/compare/1460592000/1460764800 - unclear

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Sellers:

http://www.tf2outpost.com/trade/28137651 - 13 (1 week)

http://www.tf2outpost.com/trade/28140888 - 13 (6 days)

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Sales at 11,12,12,15,42

42 is an outlier, capping 15 at 13 (sellers). Going with 11-13.