Red Morning, Sailor's Warning

https://backpack.tf/item/4044134102

Sale 1) Bulk sale for a Bonzo-the-All-Gnawing Cotton Head

https://backpack.tf/profiles/76561198011234844#!/compare/1558569600/1558656000

Sale 2) Bulk sale for an Arcana Letch's LED

https://backpack.tf/profiles/76561198297554259#!/compare/1561161600/1561248000

Sale 3) Bulk sale for 130 Keys

https://backpack.tf/profiles/76561198804015732#!/compare/1561161600/1561248000

https://backpack.tf/item/3271371663

Sale 4) Sold for $118 when Keys were ~$1.77 each

https://marketplace.tf/items/tf2/937;5;u89

https://marketplace.tf/items/tf2/5021;6

118 / 1.77 = 66.67, which rounds to 67 Keys

Sale 5) Sold for a Scorching Flames Noble Nickel Amassment of Hats (66.5 Keys) + 1 Key

https://backpack.tf/profiles/76561198064569267#!/compare/1555977600/1556064000

Taking 66.5 for the Amassment since it was updated shortly (under 2 months) before this sale occurred.

66.5 + 1 = 67.5, which rounds to 68 Keys

Sale 6) Sold + 10 Keys for a Burning Flames Tippler's Tricorne (56.5 Keys) + Haunted Ghosts Safe'n'Sound (32 Keys)

https://backpack.tf/profiles/76561198132527164#!/compare/1555977600/1556064000

https://backpack.tf/profiles/76561198452545626#!/compare/1555977600/1556064000

56.5 + 32 - 10 = 78.5, which rounds to 79 Keys

Tippler's Mini

https://backpack.tf/suggestion/5cf86cee678072340652a642 - 56.5 Keys

Safe'n'Sound Mini

https://backpack.tf/suggestion/5d1f56ac67807259ff79a759 - 32 Keys

Sale 7) ?

https://backpack.tf/profiles/76561198452545626#!/compare/1556064000/1556150400

https://backpack.tf/profiles/76561198090147535#!/compare/1555977600/1556150400