Sellers:

https://marketplace.tf/items/30355;5;u89

https://backpack.tf/item/3436930535 - b/o: $124.80 = 60 keys (long time)

Sold:

http://backpack.tf/profiles/76561198148511293#!/compare/1495152000/1495238400

http://backpack.tf/profiles/76561198190186326#!/compare/1495152000/1495238400 - sold for Strange Professional Killstreak Australium Wrench (23) = 23 keys (low)

http://backpack.tf/profiles/76561198190186326#!/compare/1495152000/1495238400

http://backpack.tf/profiles/76561198061836787#!/compare/1495152000/1495238400 - sold for Strange Voltaic Hat Protector Captain Space Mann (81) + 5 keys = 86 keys (outlier)

http://backpack.tf/profiles/76561198059344969#!/compare/1485734400/1494633600 - sold for Starstorm Slumber Mo'Horn (23) = 23 keys (low)

Mini's:

Strange Voltaic Hat Protector Captain Space Mann:

http://backpack.tf/profiles/76561198135747549#!/compare/1494633600/1494979200 - sold for Hellish Inferno Taunt: Pool Party = 81 keys

Conclusion:

sales at 23, 23, 86

seller at 60 keys for a long time (and sellers at 65 and 70 in classies)

taking 60 keys for a conservative drop