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 6.5 Keys - http://i.imgur.com/QPemq5J.png

Unsold for 11 days http://backpack.tf/item/4366698938

-

x5 for sale at 7 Keys - http://i.imgur.com/yRhuc6T.png

Unsold for 4 days http://backpack.tf/item/3169170865

Unsold for 12 days http://backpack.tf/item/2740548691

Unsold for 2 months http://backpack.tf/item/2332947790

Unsold for 2 months(Duplicated) http://backpack.tf/item/2731357133

Unsold for 5 days http://backpack.tf/item/3779184582