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 12 Refined - http://i.imgur.com/gDkOzKY.png

Unsold for 2 days http://backpack.tf/item/4909151913 - Outpost trade: http://www.tf2outpost.com/trade/28349951

Unsold for 3 days http://backpack.tf/item/4812381068

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x1 for sale at 12.33 Refined - http://i.imgur.com/yp1ulGu.png

Unsold for 2 months http://backpack.tf/item/4744616552

Outpost sellers below 13 Refined.

http://www.tf2outpost.com/trade/28349405 - 12 Refined - Poorly bumped.

Outpost unsolds at 13 Refined.

http://www.tf2outpost.com/trade/28184989 - 13 Refined - Unsold for 2 months.