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).

x2 for sale at 1 Key - http://i.imgur.com/OBXnU3x.png

Unsold for 9 hours(Strange Genuine) http://backpack.tf/item/3645495822

Unsold for 21 days http://backpack.tf/item/1015752891

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x1 for sale at 1.05 Keys - http://i.imgur.com/S8Wj3XH.png

Unsold for 3 days http://backpack.tf/item/401551220

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http://i.imgur.com/KpWvpfy.png - 1.11 Keys(1.1) - http://i.imgur.com/KpWvpfy.png

Unsold for 3 days http://backpack.tf/item/3356045576

Outpost sellers.

http://www.tf2outpost.com/trade/28354630 - 1.1 Keys - Unsold for 1 day.

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