The Grandeur

http://backpack.tf/item/4483823065

Sale 1) Sold for a Burning Flames Dragonborn Helm (200 Keys) + 46 Keys + Pro KS Aussie Black Box (27 Keys) + Pro KS Aussie Blutsauger (13 Keys)

http://backpack.tf/profiles/76561198065713150/#!/compare/1458543600/1458630000

200 + 46 + 27 + 13 = 286 Keys

Dragonborn Mini

http://backpack.tf/vote/id/5711ab3883de6b5f8a583c07 - 200 Keys

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http://backpack.tf/item/4469707318

Sale 2) Sold for a PE Neckwear (275 Keys) + Secret Front Runner (137.5 Keys) + Scorching Flames Conquistador (90 Keys)

http://backpack.tf/profiles/76561198018761801/#!/compare/1458198000/1458950400

275 + 137.5 + 90 = 502.5 Keys, which rounds to 503 Keys

Conquistador Mini

http://www.tf2outpost.com/trade/27934955 - Had a Buyout of 90 Keys

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http://backpack.tf/item/4588648623

Sale 3) Sold for a Burning Bandanna + Hot Flower Power Medi Gun (Well-Worn) + Sweets

http://backpack.tf/profiles/76561198079353261/#!/compare/1456387200/1456646400

http://www.tf2outpost.com/trade/27879224 - Capped by the Buyout of 250 Keys

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http://www.tf2outpost.com/trade/28009891 - Declined 500 Keys

http://www.tf2outpost.com/trade/28040991 - Declined $600

Calling the 2 low sales Outliers.