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).

x1 for sale at 1.12(1.1) Keys - http://i.imgur.com/wWjxyXr.png

Unsold for 4 hours(Parts Attached) http://backpack.tf/item/1081273129

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x3 for sale at 1.15 Keys - http://i.imgur.com/WrigYDE.png

Unsold for 5 days http://backpack.tf/item/1184237743

Unsold for 12 hours(Duplicated) http://backpack.tf/item/1066157484

Unsold for 21 hours http://backpack.tf/item/4721639828

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x2 for sale at 1.2 Keys - http://i.imgur.com/p8BdO6R.png

Unsold for 6 days http://backpack.tf/item/1104202436

Unsold for 1 day(Never bumped but seller seems active) http://backpack.tf/item/2863666488

Outpost sellers.

http://www.tf2outpost.com/trade/28483643 - 1.2 Keys - Unsold for 3 days.

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http://www.tf2outpost.com/trade/28349984 - Sold 1 month ago - http://backpack.tf/item/3685158334 - http://backpack.tf/profiles/76561198028665926#!/compare/1471219200/1471564800

Discounting due to how long ago it sold.

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