Classifieds: http://backpack.tf/classifieds?item=Cold%20Killer&quality=5&tradable=1&craftable=1&australium=-1&particle=36

Screenshot(s) of Classifieds:

http://imgur.com/S5WZywm

<Sellers>

26 keys | http://backpack.tf/item/5280551707 | http://backpack.tf/u/76561198073125241 | http://www.tf2outpost.com/trade/28850546 | Listed about 2 hours ago

32 keys | http://backpack.tf/item/1331309056 | http://backpack.tf/u/76561197998934095 | http://www.tf2outpost.com/trade/28837914 | Listed about a month ago [Bumped]

35 keys | http://backpack.tf/item/2487841474 | http://backpack.tf/u/76561198075435735 | http://www.tf2outpost.com/trade/28834056 | Listed 12 days ago [Bumped]

Sold:

http://backpack.tf/profiles/76561198356616035#!/compare/1487808000/1487894400 - sold for Circling Peace Sign Honcho's Headgear + 3 keys = 29 keys

http://backpack.tf/profiles/76561198204824055#!/compare/1487462400/1487548800 - sold for Memory Leak Glengarry Bonnet + 10 keys + sweets = 28 keys

http://www.tf2outpost.com/trade/28843380

http://backpack.tf/profiles/76561198118921483#!/compare/1490572800/1490659200 - sold for Cauldron Bubbles Little Buddy = 31 keys b/o

http://www.tf2outpost.com/trade/28806709

http://backpack.tf/profiles/76561198044934255#!/compare/1490054400/1490227200 - sold with 3 keys for Infernal Flames Taunt: The Carlton = 36 keys (outlier)

Mini's:

Circling Peace Sign Honcho's Headgear:

http://www.tf2outpost.com/trade/28819075

http://backpack.tf/profiles/76561197962621294#!/compare/1489017600/1489104000 - sold for Dead Presidents Killer's Kabuto = 26 keys

Memory Leak Glengarry Bonnet:

http://backpack.tf/profiles/76561198255799196#!/compare/1488326400/1488499200 - sold for Miami Nights Tam O' Shanter = 17 keys

Cauldron Bubbles Little Buddy:

http://www.tf2outpost.com/trade/28850448 - b/o: 33 keys