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 8 Keys - http://i.imgur.com/auxJwMA.png

Unsold for 12 days http://backpack.tf/item/3815556033

Unsold for 12 days(Duplicated) http://backpack.tf/item/2818768382

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x2 for sale at 9 Keys - http://i.imgur.com/BIqPYxY.png

Unsold for 2 months http://backpack.tf/item/2566336845

Unsold for 2 months http://backpack.tf/item/3461087497

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x1 for sale at 10 Keys - http://i.imgur.com/gO7fdcW.png

Unsold for 2 months http://backpack.tf/item/2296658176

Outpost sellers.

http://www.tf2outpost.com/trade/28083482 - 10 Keys - Unsold for 4 months.