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.

x2 for sale at 2.5 Keys - http://i.imgur.com/d9swJ8f.png

Unsold for 4 days http://backpack.tf/item/4238986865

"quicksell", Unsold for 8 days http://backpack.tf/item/3716467007

-

x2 for sale at 2.55 Keys - http://i.imgur.com/I8DbjX3.png

Unsold for 5 days http://backpack.tf/item/3821022021

Unsold for 6 days http://backpack.tf/item/3280897426

Buyers suggest 2.2 Keys and less is the quickbuy/sell price - http://i.imgur.com/BNWtipC.png

Outpost sellers below 2.6 Keys.

http://www.tf2outpost.com/trade/28342726 - "bp.tf price -10%" = 2.34 Keys(2.35)

Outpost unsolds at 2.6 Keys.

http://www.tf2outpost.com/trade/28352911 - 2.6 Keys - Young.

http://www.tf2outpost.com/trade/28353067 - 2 Keys+ 10 Refined= 2.57 Keys(2.6) - Young.

"Sales."

http://www.tf2outpost.com/trade/28300988

I am suspicious of this one, I believe it didn't sell judging by the sell-listing this user also has on the Classifieds - http://i.imgur.com/xVs4gij.png - If we look at the history of that item we can see it has been traded back and forth between the 2 users (seller and the current owner of the "sold" item in the trade above http://backpack.tf/item/3821022021

But, if we are judging by sheer item history >

Advertised as 2.55 Keys but eventually sold to a quickbuyer > [see item history] > http://i.imgur.com/pg8AKch.png

http://backpack.tf/u/76561197991924473

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