I tried so hard and got so far, but in the end, it doesn't even matter.

https://backpack.tf/item/4591258453

Sale 1) ?

https://backpack.tf/profiles/76561198106409123#!/compare/1559865600/1560211200

Probably a marketplace sale.

Sale 2) Bulk sale for a Bonzo-the-All-Gnawing Greased Lightning

https://backpack.tf/profiles/76561198232041512#!/compare/1562457600/1562544000

Sale 3) Bulk sale for a Cloudy Moon Napper's Respite

https://backpack.tf/profiles/76561198055622215#!/compare/1562630400/1562716800

https://backpack.tf/item/1884450493

Sale 4) ?

https://backpack.tf/profiles/76561198035040460#!/compare/1558483200/1561766400

Probably a marketplace sale.

Sale 5) Sold for 68 Keys

https://backpack.tf/profiles/76561198119149660#!/compare/1562112000/1562198400

https://backpack.tf/profiles/76561198855485521#!/compare/1562112000/1562198400

https://marketplace.tf/items/tf2/248;5;u70 - Sold for $100 when Keys were ~$1.81 each and ~$1.84 each

100 / 1.81 = 55.24, which rounds to 55 Keys

100 / 1.84 = 54.35, which rounds to 55 Keys

https://imgur.com/a/vim3zkk - Buyer at 55 Keys and another at 56 Keys suggest 54 and 55 are too low.

https://backpack.tf/u/76561198305494036

https://backpack.tf/u/76561198306288794