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.

x2 for sale at 2 Refined - http://i.imgur.com/cJTQvL5.png

Unsold for 4 hours http://backpack.tf/item/747795555

Unsold for 19 hours http://backpack.tf/item/1108928777

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x1 for sale at 2.22 Refined - http://i.imgur.com/f8ohyNX.png

Unsold for 2 days http://backpack.tf/item/211294347

Outpost sellers.

http://www.tf2outpost.com/trade/28347731 - 2.33 Refined - Unsold for 3 days.

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