Sold for 60 keys:

http://i.gyazo.com/0cc329fd07c60347154fbb7ce474eb2e.png

60 keys

Sold with Orbiting Planets Brotherhood of Arms for Burning Flames Triboniophorus Tyrannus:

http://backpack.tf/profiles/76561198066619372?time=1430982000 (May 7th)

http://backpack.tf/profiles/76561198066619372?time=1431241200 (May 10th)

Outlier.

Bulk sale for Burning Flames Troublemaker's Tossle Cap:

http://backpack.tf/profiles/76561198126011819?time=1430377200 (April 30th)

http://backpack.tf/profiles/76561198126011819?time=1430463600 (May 1st)

Sold with 13 keys for Disco Beat Down Exquisite Rack (72):

http://backpack.tf/profiles/76561198057745983?time=1427180400 (March 24th)

http://backpack.tf/profiles/76561198057745983?time=1427266800 (March 25th)

72 * .9 - 13 = 51.8 keys

Rounded to 52 keys

Sold for Darkblaze Grenadier's Softcap:

http://backpack.tf/profiles/76561198057745983?time=1427958000 (April 2nd)

http://backpack.tf/profiles/76561198057745983?time=1428044400 (April 3rd)

Sold for 50 keys:

http://www.tf2outpost.com/trade/25644235

http://backpack.tf/profiles/76561198000754743?time=1430031600 (April 26th)

http://backpack.tf/profiles/76561198000754743?time=1430377200 (April 30th)

50 keys

Bulk sale for Sunbeams Thirst Blood:

http://backpack.tf/profiles/76561198149516147?time=1430118000 (April 27th)

http://backpack.tf/profiles/76561198149516147?time=1430204400 (April 28th)

Sold with ~15 keys for Midnight Whirlwind Taunt: The High Five! (70):

http://i.gyazo.com/c437cf79122bb7e7f8f5eedb05349d58.png

70 - 15 = 55 keys

Owner offered.

Seller at 50 keys:

http://www.tf2outpost.com/trade/25938797

http://www.tf2outpost.com/trade/25784645

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Midnight Whirlwind Taunt: The High Five!:

Using 70 keys