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 3 Refined - http://i.imgur.com/XAptZ2v.png

Unsold for 1 month http://backpack.tf/item/622680908

Unsold for 1 day http://backpack.tf/item/460740387

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x1 for sale at 3.33 Refined - http://i.imgur.com/wH1n0of.png

Unsold for 21 days http://backpack.tf/item/1018502423

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x1 for sale at 3.66 Refined - http://i.imgur.com/E3AWPsF.png

Unsold for 11 days http://backpack.tf/item/598058517

Outpost sellers.

http://www.tf2outpost.com/trade/28328933 - 3.66 Refined - Unsold for 1 week.

http://www.tf2outpost.com/trade/28260809 - 3.66 Refined - Unsold for 1 month.

Speaks for itself.