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

x3 for sale at 6 Keys - http://i.imgur.com/jgLqvYW.png

Unsold for 6 hours http://backpack.tf/item/2469193289

Unsold for 20 hours http://backpack.tf/item/2345286060

Unsold for 2 days http://backpack.tf/item/2368642467

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x1 for sale at 6.29(6.3) Keys - http://i.imgur.com/jEOwmuU.png

Unsold for 5 hours http://backpack.tf/item/5019290291

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x1 for sale at 6.36(6.35) Keys - http://i.imgur.com/j0Yx7aW.png

Unsold for 3 days http://backpack.tf/item/5022609188

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x3 for sale at 6.37/6.39(6.4) Keys - http://i.imgur.com/JANeBBz.png

Unsold for 3 days http://backpack.tf/item/3713004430

Unsold for 6 days http://backpack.tf/item/2633961510

Unsold for 15 hours http://backpack.tf/item/2422830027

6 Keys sellers are countered by buyers: http://i.imgur.com/o9pkrY7.png

6.18 Keys buyer > http://backpack.tf/u/76561197997268820

6.15 Keys buyer > http://backpack.tf/u/76561198041822925

6.15 Keys buyer > http://backpack.tf/u/76561197998801633

6.1 Keys buyer > http://backpack.tf/u/76561197999873164

Outpost sellers.

http://www.tf2outpost.com/trade/28445551 - 6 Keys - Young - Waterlogged paint.

http://www.tf2outpost.com/trade/28439917 - 6.4 Keys - Unsold for 2 days - Parts Attached.

http://www.tf2outpost.com/trade/28430830 - 6.5 Keys - Unsold for 6 days.

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