http://www.tf2outpost.com/trade/25849053

Quick-sold for 70 keys

http://backpack.tf/profiles/76561198025613718?time=1430636400 (May 3rd)

http://backpack.tf/profiles/76561198025613718?time=1430722800 (May 4th)

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http://www.tf2outpost.com/trade/25763869

Sold for a DP Viewfinder (90)

http://backpack.tf/profiles/76561197993258470?time=1430118000 (April 27th)

http://backpack.tf/profiles/76561197993258470?time=1430204400 (April 28th)

90 * 0.9 = 81 keys

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http://www.tf2outpost.com/trade/25746935

Sold for a Peace Sign Kiss King + 8 keys

This sale can't be used since it was used to price the Kiss King.

http://backpack.tf/profiles/76561198078774677?time=1429167600 (April 16th)

http://backpack.tf/profiles/76561198078774677?time=1429513200 (April 20th)

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Sold for Duped KaW Crone's + PFetti Grimm + 1 key + 1 key in items

http://backpack.tf/profiles/76561198111347658?time=1429772400 (April 23rd)

http://backpack.tf/profiles/76561198111347658?time=1429858800 (April 24th)

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Complex sale for duped V. Big Kill

http://backpack.tf/profiles/76561198134905503?time=1429426800 (April 19th)

http://backpack.tf/profiles/76561198134905503?time=1429513200 (April 20th)

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http://www.tf2outpost.com/trade/25682202

Sold for Terror-Watt TC (114) + Stormy Mongolian (~10)

http://backpack.tf/profiles/76561198025329724?time=1428735600 (April 11th)

http://backpack.tf/profiles/76561198025329724?time=1428822000 (April 12th)

(114 + 10) * 0.9 = 111.6; rounded to 112 keys

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http://www.tf2outpost.com/trade/25565752

Sold for 20 or 21 buds (5 keys each) ~100 keys

http://backpack.tf/profiles/76561198161180874?time=1427871600 (April 1st)

http://backpack.tf/profiles/76561198161180874?time=1427958000 (April 2nd)

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http://www.tf2outpost.com/trade/25620574

Sold for a Sulph Hat of Cards (94) + 6 keys

http://backpack.tf/profiles/76561198057041115?time=1428303600 (April 6th)

http://backpack.tf/profiles/76561198057041115?time=1428390000 (April 7th)

The Gibus was used to update the Hat of Cards, however the range is still the same without this sale.

Hat of Cards: http://www.tf2outpost.com/trade/25610697

(94 * 0.9) + 6 = 90.6; rounded to 91 keys

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Stormy Mongolian:

http://www.tf2outpost.com/trade/25901622 Seller at 10 keys

Sales are 70, 81, 91, 100, and 112. A range of 80-110 should work.