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).

x1 for sale at 1.55 Refined - http://i.imgur.com/XxcsFLN.png

Unsold for 1 day http://backpack.tf/item/2338635976

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x1 for sale at 1.66 Refined - http://i.imgur.com/V1uWRTQ.png

Unsold for 15 hours http://backpack.tf/item/2106492068

Outpost sellers.

http://www.tf2outpost.com/trade/28356238 - 0.33 Refined - Item sold to a lowballquickbuy bot(the same bot selling the item for 1.55 Refined) http://backpack.tf/profiles/76561198094952141#!/compare/1468886400/1469232000

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http://www.tf2outpost.com/trade/28301933 - 1.66 Refined - Unsold for 3 weeks.