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 2.37 Keys(2.4) - http://i.imgur.com/ar9o6iR.png

Unsold for 1 hour http://backpack.tf/item/2840012693

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x1 for sale at 2.42 Keys(2.4) - http://i.imgur.com/AgEMwQs.png

Unsold for 4 days http://backpack.tf/item/1449341854

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x4 for sale at 2.47 Keys(2.5) - http://i.imgur.com/QswsD60.png

Unsold for 3 days http://backpack.tf/item/975284006

Unsold for 3 days http://backpack.tf/item/1382790541

Unsold for a few minutes http://backpack.tf/item/1018080690

Unsold for 6 days http://backpack.tf/item/618355532

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x1 for sale at 2.51 Keys(2.5) - http://i.imgur.com/OafXuwv.png

Unsold for 8 days http://backpack.tf/item/610983364

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x2 for sale at 2.53 Keys(2.55) - http://i.imgur.com/VAu1ySO.png

Unsold for 4 days http://backpack.tf/item/1034187452

Unsold for 4 days http://backpack.tf/item/2654997902

Outpost sellers.

http://www.tf2outpost.com/trade/28355260 - 2.65 Keys - Unsold for 1 day.

http://www.tf2outpost.com/trade/28305318 - 2.65 Keys - Unsold for 2 weeks.

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