Classifieds at the time of posting this suggestion.

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 14 Keys - http://i.imgur.com/EkFmESx.png

Unsold for 2 days http://backpack.tf/item/266217245 > Outpost trade http://www.tf2outpost.com/trade/28464028 - 14 Keys - Unsold for 2 days.

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x1 for sale at 15 Keys - http://i.imgur.com/awvjfLJ.png

Unsold for 9 minutes http://backpack.tf/item/275876146 > Outpost trade http://www.tf2outpost.com/trade/28469600 - 15 Keys - Young.