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).

x2 for sale at 7.55 Keys - http://i.imgur.com/Lx8S7pq.png

Unsold for 8 hours http://backpack.tf/item/1818249546

Unsold for 15 hours http://backpack.tf/item/1689544886

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x1 for sale at 7.6 Keys - http://i.imgur.com/QA0rTtA.png

Unsold for 2 days http://backpack.tf/item/4786723899

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x1 for sale at 7.7 Keys - http://i.imgur.com/pklmTv1.png

Unsold for 8 days http://backpack.tf/item/1541512245

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x6 for sale at 8 keys - http://i.imgur.com/xCuCaUU.png

Unsold for 9 days http://backpack.tf/item/2081698537

Unsold for 12 days http://backpack.tf/item/3734361775

Unsold for 7 days http://backpack.tf/item/1803723995

Unsold for 2 days http://backpack.tf/item/1929201032

Unsold for 6 days http://backpack.tf/item/1838382747

Unsold for 2 days http://backpack.tf/item/2054756521

Outpost sellers.

http://www.tf2outpost.com/trade/28440871 - 7.6 Keys - Unsold for 2 days.

http://www.tf2outpost.com/trade/28441490 - 8 Keys - Unsold for 1 day.

http://www.tf2outpost.com/trade/28419470 - 8 Keys - Unsold for 1 week.

http://www.tf2outpost.com/trade/28370589 - 8 Keys - Unsold for 4 weeks.

http://www.tf2outpost.com/trade/28345094 - 8 Keys - Unsold for 1 month.

http://www.tf2outpost.com/trade/28257840 - 8 Keys - Unsold for 2 months.

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http://www.tf2outpost.com/trade/28351924 - 10 Keys - x1 sold for 9 keys 3 weeks ago, x1 still unsold - Mentioning this here as it has 1 sale, but I doubt that sale matters anymore, 3 weeks old coupled with the proof above.

http://backpack.tf/profiles/76561198031371895#!/compare/1470528000/1470700800 (The PDA was later used in an Unusual trade)

The 7.55 sellers are a bit young, but that coupled with the unsolds at the other prices shows 7.55 is fine.

If anything they can age here.

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