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 9 Keys - http://i.imgur.com/gu6ONXj.png

Unsold for 11 days http://backpack.tf/item/3080647421

Unsold for 11 days http://backpack.tf/item/3495579240

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x1 for sale at 10 keys - http://i.imgur.com/4Hrbd33.png

Unsold for 8 days(Specialized Killstreak) http://backpack.tf/item/2589920370 > Outpost trade; http://www.tf2outpost.com/trade/28438692

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x3 for sale at 11 Keys - http://i.imgur.com/ek3kWvc.png

Unsold for 19 days(Specialized Killstreak, Duplicated) http://backpack.tf/item/2634068525 - It has not switched inventories, the item is duplicated.

Unsold for 10 days http://backpack.tf/item/4611630036 > Outpost trade; http://www.tf2outpost.com/trade/28296308

Unsold for 2 days http://backpack.tf/item/4977681900 > Outpost trade; http://www.tf2outpost.com/trade/28423929

Outpost sellers.

http://www.tf2outpost.com/trade/28438112 - 11 Keys - Unsold for 3 days - Killstreak.