Classifieds: http://backpack.tf/classifieds?item=Towering%20Pillar%20of%20Hats&quality=5&tradable=1&craftable=1&australium=-1&particle=109

Screenshot(s) of Classifieds:

http://imgur.com/vDe4Ry5

<Sellers>

50 keys | http://backpack.tf/item/5188285785 | http://backpack.tf/u/76561198164651434 | http://www.tf2outpost.com/trade/28837749 | Listed 20 days ago [Bumped]

70 keys | http://backpack.tf/item/5187675558 | http://backpack.tf/u/76561198032176942 | http://www.tf2outpost.com/trade/28843838 | Listed about a month ago [Bumped]

Sold:

http://www.tf2outpost.com/trade/28768538

http://backpack.tf/profiles/76561198032176942#!/compare/1486771200/1486857600 - sold with Strange Specialized Killstreak Australium Sniper Rifle for Cloud 9 Neckwear Headwear = 38 keys

Mini's:

Cloud 9 Neckwear Headwear:

http://www.tf2outpost.com/trade/28818252

http://backpack.tf/profiles/76561198210225228#!/compare/1488931200/1489017600 - sold for '72 Taunt: I See You + Circling Peace Sign Smoking Skid Lid = 64 keys