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 2.26(2.25) Keys - http://i.imgur.com/HkBFOfD.png

Unsold for 3 days http://backpack.tf/item/5040477328

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x1 for sale at 2.28(2.3) Keys - http://i.imgur.com/76KPnaU.png

Unsold for 8 days http://backpack.tf/item/2346062185 > Outpost trade http://www.tf2outpost.com/trade/28379855

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x2 for sale at 2.34(2.35) Keys - http://i.imgur.com/dugHKik.png

Unsold for 14 days http://backpack.tf/item/2533746867

Unsold for 3 days http://backpack.tf/item/2385340245

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x2 for sale at 2.37(2.4) Keys - http://i.imgur.com/gxOHFTr.png

Unsold for 18 days http://backpack.tf/item/4957382681

Unsold for 18 days http://backpack.tf/item/2453601715