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.

x9 for sale at 1.55 Refined - http://i.imgur.com/tGeUfuN.png

Unsold for 1 day http://backpack.tf/item/4352485661

Unsold for 4 hours(the next 3 are from the same seller) http://backpack.tf/item/4963998081 - http://backpack.tf/item/4978728005 - http://backpack.tf/item/4890727018

Unsold for 2 days http://backpack.tf/item/4929145407

Unsold for 9 hours http://backpack.tf/item/4872525656

Unsold for 13 hours http://backpack.tf/item/3970445037

Unsold for 4 days http://backpack.tf/item/4591772860

Unsold for 1 day http://backpack.tf/item/4157809103

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x3 for sale at 1.66 Refined - http://i.imgur.com/gNFGpXL.png - http://i.imgur.com/mKW9tB8.png

Unsold for 8 hours http://backpack.tf/item/4670386648

Unsold for 10 hours http://backpack.tf/item/4334877345

Unsold for 15 days http://backpack.tf/item/4950607613

Outpost sellers.

http://www.tf2outpost.com/trade/28354759 - 1.66 Refined - Young.

http://www.tf2outpost.com/trade/28343704 - 1.66 Refined - 4 days.

http://www.tf2outpost.com/trade/28354667 - 1.66 Refined - Unsold for 1 week > http://www.tf2outpost.com/trade/28323400

http://www.tf2outpost.com/trade/28319482 - 1.66 Refined - Unsold for 2 weeks.

http://www.tf2outpost.com/trade/28254120 - 1.66 Refined - Unsold for 1 month.

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http://www.tf2outpost.com/trade/28311972 - 1.66 Refined - x1 sold 11 days ago - x1 unsold for 2 weeks.

PS: It's the strongest of possibilities that it sold due to it being Level 42 http://backpack.tf/item/4855301841

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