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 27 Keys - http://i.imgur.com/PXSfOl8.png

Unsold for 4 days http://backpack.tf/item/4590035761 - User has been offline on the site for 4 days, not counting.

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x1 for sale at 28 Keys - http://i.imgur.com/QvhW4KF.png

Unsold for 10 hours http://backpack.tf/item/4129211197

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x2 for sale at 29 Keys - http://i.imgur.com/QHu8CwW.png

Unsold for 2 days http://backpack.tf/item/4401816936

Unsold for 2 days http://backpack.tf/item/4130973842

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x1 for sale at 30 Keys - http://i.imgur.com/lQ9QzS5.png

Unsold for 11 days http://backpack.tf/item/4121318663

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x2 for sale at 31 Keys - http://i.imgur.com/8456iHh.png

Unsold for 21 days http://backpack.tf/item/4110457442

Unsold for 17 days http://backpack.tf/item/4159519309

Outpost sellers

http://www.tf2outpost.com/trade/28437982 - 30 Keys - Unsold for 1 day - Autobumper.

http://www.tf2outpost.com/trade/28398396 - 30 Keys - Unsold for 2 weeks - Autobumper.

I am excluding all sellers/buyers with their price as "bp.tf price" as the item has a flexible price making it an unclear price.

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