Classifieds at the time of posting this suggestion.

The age of the listing(s) are shown in the screenshot(s) rather than the last bump.

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

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x2 for sale at ~2.2 Keys - http://i.imgur.com/1psanyE.png

Unsold for 1 day http://backpack.tf/item/5291148687

Unsold for 1 day http://backpack.tf/item/5191236609

Unsold for 5 days http://backpack.tf/item/5058728250

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x1 for sale at 2.25 Keys - http://i.imgur.com/A2ysYds.png

Unsold for 15 hours http://backpack.tf/item/5515804772

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x1 for sale at ~2.4 Keys - http://i.imgur.com/EaxHQm1.png

Unsold for 1 day http://backpack.tf/item/5409337956

Outpost sellers.

Overpriced, special levels or sold in sets.

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Yes.