Four.

Sale # 1 - Sold 3 keys in an item for GE Topi 25 keys

http://www.tf2outpost.com/trade/27031142

http://backpack.tf/profiles/76561198052250908?time=1442300400 (September 15th)

http://backpack.tf/profiles/76561198052250908?time=1442386800 (September 16th)

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Sale # 2 - Sold for Strange Professional Killstreak Australium Ambassador = 25 keys Items histories and ID's do not match the hats.

http://www.tf2outpost.com/trade/26646845

http://backpack.tf/profiles/76561198056869760?time=1441436400 (September 5th)

http://backpack.tf/profiles/76561198056869760?time=1441609200 (September 7th)

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Outpost Sellers

None

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Mini's

GE Topi - Sold for a lvl 7 Max ~ 28 Keys

No trade

http://backpack.tf/profiles/76561198159523911?time=1442559600 (September 18th)

http://backpack.tf/profiles/76561198159523911?time=1442646000 (September 19th)

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Strange Professional Killstreak Australium Ambassador ~

$68 (.9) = 61/2.5 = 25 Keys

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25 Keys flat.

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Any tips or suggestions leave below!

Have an awesome day! :3