Deer Knight

https://backpack.tf/item/2192017214

Sale 1) Sold + 2 Keys for a Cloud 9 Modest Pile of Hat (42 Keys) + Circling Heart Slick Cut (32 Keys)

https://backpack.tf/profiles/76561198263344996#!/compare/1503360000/1503446400

42 + 32 = 74 - 2 = 70 Keys

Modest Mini

https://backpack.tf/suggestion/5a0cec03cf6c756f9477d391 - 42 Keys

Slick Mini

Sold + 2.5 Keys of Black Paint + 2 Keys for a Pro KS Australium Medi Gun (~36.5 Keys)

https://backpack.tf/profiles/76561198202135278#!/compare/1502496000/1502582400

36.5 - 2.5 - 2 = 32 Keys

I used this Mini because there were no other sales I could find that were within the past 3 Months and not Bulk (the one Bulk sale made this + Modest 71 Keys)

Sale 2) Sold for a Green Energy Baron von Havenaplane (38.5 Keys) + Vivid Plasma A Rather Festive Tree (35 Keys)

https://backpack.tf/profiles/76561198202135278#!/compare/1503619200/1503705600

38.5 + 35 = 73.5, which rounds to 74 Keys