Classifieds at the time of posting this suggestion.

The age of the listing(s) are shown in the screenshot(s) rather than the last bump.

Unsolds and item histories are presented in chronological order according to the screenshot(s).

x2 for sale at 2 Keys - http://i.imgur.com/Lk0gzYP.png

Unsold for 1 day http://backpack.tf/item/5021789859

Unsold for 19 hours http://backpack.tf/item/4986216695

Outpost sellers.

http://www.tf2outpost.com/trade/28458391 - 2 Keys.

User has changed the price while the post has been up.

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