Happy likes this.

Sale 1

Sold for 15 keys

http://backpack.tf/profiles/76561198128005244#!/compare/1471996800/1472083200 (sort by time here)

http://backpack.tf/profiles/76561198084891833#!/compare/1472083200/1472342400

http://www.tf2outpost.com/trade/28408449 ----- B/O was removed.

The Gibus was sold for keys, and then the keys were used for the Mongolian.

=======> 15 keys

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Sale 2

Sold for a Vivid Mongolian (mini at 15) + ~4 keys in sweets.

http://backpack.tf/profiles/76561198194893602#!/compare/1468713600/1468800000

No Outpost trade

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Mini for the Vivid Mongolian: Sold for an Aussie Sticky (15)

http://backpack.tf/profiles/76561198138584731#!/compare/1469664000/1469750400

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=======> 15 + 4 = 19 keys

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Sale 3

Sold for an Strange SKS Festive Minigun (mini at 7) + 3 keys

http://backpack.tf/profiles/76561198194893602#!/compare/1468800000/1468886400

http://backpack.tf/profiles/76561198161163090#!/compare/1468800000/1468972800

No Outpost trade.

The Mongolian was sold for the Minigun + keys, and then they were used to buy the Orbiting Fire One-Man Army.

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Mini for the Minigun: Sellers for 6 are young, so i'm going with 7 keys.

http://imgur.com/a/t9v3u

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=======> 7 + 3 = 10 keys

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Other sales are either untraceable or involve Scrap.tf, as far as i can tell.

Sellers

- http://imgur.com/a/s890U ----- 20 keys

Summary

- Sales for 10, 15, 19.

- The guy who bought it for 19, sold it for 10.

Going with 15 keys, which is the most recent, full pure sale. I will exclude both 10 and 19 sales because they seem to be outliers. The guy who bought it for 19, then sold it for 10 which doesn't make sense.

Criticism appreciated!