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.

x1 for sale at 3.83 Keys, rounded off to 3.85 Keys - http://i.imgur.com/n2UiJxp.png

http://backpack.tf/item/3269786168

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x12 for sale at 3.84 Keys, rounded off to 3.85 Keys - http://i.imgur.com/GAefqUv.png http://i.imgur.com/gpws2u4.png

Unsold for 20 hours http://backpack.tf/item/3927359971

Unsold for 9 hours http://backpack.tf/item/3610667640

The next 8 are from the same seller; Unsold for 9 hours: http://backpack.tf/item/4488309012 - http://backpack.tf/item/3422274997 - http://backpack.tf/item/3311228687 - http://backpack.tf/item/4917696645 - http://backpack.tf/item/3271838162 - http://backpack.tf/item/3273783854 - http://backpack.tf/item/4426790953 - http://backpack.tf/item/3956849812

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x6 for sale at 3.89 Keys, rounded off to 3.9 Keys - http://i.imgur.com/28A5mFE.png

Unsold for 3 days http://backpack.tf/item/3896685210

Unsold for 1 day http://backpack.tf/item/3822129004

Next 3 items are from the same seller; Unsold for 1 day http://backpack.tf/item/4229473579 - http://backpack.tf/item/4693818568 - http://backpack.tf/item/4915797147

Unsold for 12 hours http://backpack.tf/item/4692465229

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x1 for sale at 3.92 Keys, rounded off to 3.9 Keys - http://i.imgur.com/386Nre7.png

Unsold for 6 days http://backpack.tf/item/3269036503

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x6 for sale at 4 Keys - http://i.imgur.com/EyHZR8k.png

Unsold for 8 days http://backpack.tf/item/3568498833

Unsold for 12 hours http://backpack.tf/item/4745960661

Unsold for 15 hours http://backpack.tf/item/3506552106

Unsold for 1 day http://backpack.tf/item/3430879793

Unsold for 6 days http://backpack.tf/item/4163540003

Unsold for 7 days http://backpack.tf/item/4940824522

Outpost sellers below 4 Keys.

Non.

Outpost unsolds at 4 Keys.

http://www.tf2outpost.com/trade/28345984 - 4 Keys - Unsold for 2 days.

http://www.tf2outpost.com/trade/28341480 - 4 Keys - Unsold for 3 days.

http://www.tf2outpost.com/trade/28336832 - 4 Keys - Unsold for 5 days.

http://www.tf2outpost.com/trade/28320449 - 4 Keys - Unsold for 1 week.

http://www.tf2outpost.com/trade/28295574 - 4 Keys - Unsold for 3 weeks.