Classifieds at the time of posting this suggestion.

Unsolds are based on how long the listing has been up; Listing has been up 5 days and item been in the sellers inventory for 8 days? It has been unsold for 5 days.

The age of the listing(s) are shown in the screenshots rather than the last bump - Unsolds and item histories are presented in chronological order according to the screenshot(s).

x1 for sale at 2.47 Keys(2.5) - http://i.imgur.com/4Tu0chc.png

Unsold for 2 days http://backpack.tf/item/1673183650

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x1 for sale at 51.33 Refined(2.7 Keys) - http://i.imgur.com/z7Otgvf.png

Unsold for 2 days http://backpack.tf/item/2088569598

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x1 for sale at 2.79 Keys(2.8) - http://i.imgur.com/ABNVlbv.png

Unsold for 4 days http://backpack.tf/item/1310165965

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x1 for sale at 2.84 Keys(2.85) - http://i.imgur.com/Qve6DJ4.png

Unsold for 5 days http://backpack.tf/item/2165836304 , Outpost trade > http://www.tf2outpost.com/trade/28336003

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x1 for sale at 2.89 Keys(2.9) - http://i.imgur.com/9e8TCV6.png

Unsold for 13 days http://backpack.tf/item/4461069619

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x1 for sale at 2.95 Keys - http://i.imgur.com/0Tpimu1.png

Unsold for 3 days http://backpack.tf/item/1293566485

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x3 for sale at 3 keys - http://i.imgur.com/3jrGZgX.png

Unsold for 16 days http://backpack.tf/item/2809599101 , Outpost trade > http://www.tf2outpost.com/trade/28356145

Unsold for 20 days http://backpack.tf/item/2207922140 , Outpost trade > http://www.tf2outpost.com/trade/28356144

Unsold for 3 months http://backpack.tf/item/3714559848

Outpost sellers below 3 Keys.

http://www.tf2outpost.com/trade/28333414 - 2 Keys+ 18 Refined, 2.95 Keys - Unsold for 1 week.

Outpost unsolds at 3 Keys.

http://www.tf2outpost.com/trade/28128504 - 3 Keys - Unsold for 2 months.

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