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 2.5 Keys - http://i.imgur.com/tUOHSeT.png

Unsold for 2 hours http://backpack.tf/item/4744921668

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x1 for sale at 2.63(2.65) Keys - http://i.imgur.com/mn2GY7W.png

Unsold for 3 days http://backpack.tf/item/4683535020

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x3 for sale at 3 Keys - http://i.imgur.com/V8pXr4i.png

Unsold for 5 hours http://backpack.tf/item/4512214808

Unsold for 1 day(After Eight paint+Parts Attached) http://backpack.tf/item/4487924778

Unsold for 3 days http://backpack.tf/item/4648255953

2.5 Keys seller countered by buyers; http://i.imgur.com/nXyIThm.png

2.5 Keys buyer: http://backpack.tf/u/76561198313727931

Outpost sellers.

http://www.tf2outpost.com/trade/28439322 - 3 Keys - Unsold for 4 days.

http://www.tf2outpost.com/trade/28410877 - 3 Keys - Unsold for 2 weeks.

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