Classifieds at the time of posting this suggestion.

The age of the listing(s) are shown in the screenshot(s) rather than the last bump.

Unsolds and item histories are presented in chronological order according to the screenshot(s).

x2 for sale at 7 Keys - http://i.imgur.com/Fi4kJ22.png

Unsold for 2 hours http://backpack.tf/item/1947568308

Unsold for 17 hours http://backpack.tf/item/3562224795

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x1 for sale at 7.2 Keys - http://i.imgur.com/DumQLuu.png

Unsold for 2 days http://backpack.tf/item/1835634549

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x2 for sale at 7.25 Keys - http://i.imgur.com/Di0Xy61.png

Unsold for 2 days http://backpack.tf/item/1838382747

Unsold for 3 days http://backpack.tf/item/1697696398

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x1 for sale at 7.3 Keys - http://i.imgur.com/jzS1g4M.png

Unsold for 5 days http://backpack.tf/item/1779019112

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x1 for sale at 7.35 Keys - http://i.imgur.com/LQ0gDfE.png

Unsold for 7 days http://backpack.tf/item/1865133747

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x3 for sale at 7.4 Keys - http://i.imgur.com/Gjsf8Gx.png

Unsold for 5 days http://backpack.tf/item/1871162877

Unsold for 5 days http://backpack.tf/item/1827270707

Unsold for 5 days http://backpack.tf/item/1543436097

7 Keys is countered by buyers: http://i.imgur.com/zKpLpWO.png

Outpost sellers.

http://www.tf2outpost.com/trade/28478023 - 7.3 Keys - Unsold for 1 week - Autobumper.

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http://www.tf2outpost.com/trade/28485321 - ~7.5 Keys - Unsold for 1 week - Autobumper.

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http://www.tf2outpost.com/trade/28470376 - 7.55 Keys - Unsold for 2 weeks.

I am excluding all trades on Outpost that haven't been bumped in 1 day or more.