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).

x2 for sale at 3 Keys - http://i.imgur.com/A0V2zSW.png

Unsold for 1 day http://backpack.tf/item/2458590828

Unsold for 10 hours http://backpack.tf/item/2344745226

-

x3 for sale at 3.2 Keys - http://i.imgur.com/mUVmEOl.png

Unsold for 8 days(Parts Attached) http://backpack.tf/item/2533101394

Unsold for 3 days http://backpack.tf/item/4959214716

Unsold for 3 days http://backpack.tf/item/4980885306

Outpost sellers.

http://www.tf2outpost.com/trade/28408046 - 3 Keys - Unsold for 2 weeks.

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