Enjoy the Ride

https://backpack.tf/item/6378496137

Sale 1) ?

https://backpack.tf/profiles/76561198268140274#!/compare/1563753600/1564099200

https://backpack.tf/profiles/76561198047819527#!/compare/1563494400/1563840000

https://backpack.tf/item/6483345460

Sale 2) Sold in a day for $130 to presumably a buy order

https://marketplace.tf/items/tf2/30897;5;u17

https://backpack.tf/item/7085429738

Sale 3) Bulk sale for a Green Energy Law

https://backpack.tf/profiles/76561198123261206#!/compare/1564704000/1564963200

https://backpack.tf/item/7466095330

Sale 4) Sold for 65 Keys

https://backpack.tf/profiles/76561198140010255#!/compare/1559865600/1559952000

Sale 5) Sold for an Ether Trail Prehistoric Pullover (76.5 Keys) + ~9 Keys of Unusual Taunts

https://backpack.tf/profiles/76561198291712570#!/compare/1560124800/1560384000

76.5 + 9 = 85.5, which rounds to 85 Keys

Taunts Minis

https://imgur.com/a/WgDOEJM - Sellers down to 3.5 Keys, Buyers up to 2.8 Keys for the Breakdance

https://imgur.com/a/snJT62X - Sellers down to 5.5 Keys, Buyers up to 4.65 Keys for the Burstchester

Sale 6) Sold for a Harvest Moon Conquistador + Bubbling Detective Noir + Overclocked Pyro's Boron Beanie + Schadenfreude (1 Key)

https://backpack.tf/profiles/76561198291712570#!/compare/1561420800/1561507200

https://imgur.com/a/4YE2A1v - Capped by the Buyout of 80 Keys

Sale 7) Sold + ~55 Keys of Unusuals for a Scorching Flames Winter Woodsman

https://backpack.tf/profiles/76561198117971944#!/compare/1562025600/1562112000

Better for the Woodsman.

Sale 8) Sold for 70 Keys + Spectral Spectrum Uncraftable Crone's Dome (3 Keys)

https://backpack.tf/profiles/76561198198896481#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198082294224#!/compare/1562112000/1562198400

70 + 3 = 73 Keys

Crone's Mini

https://backpack.tf/profiles/76561198132980610#!/compare/1563753600/1563840000 - Sold for 3 Keys

Sale 9) Sold + 5 Keys for a Cloudy Moon Vintage Merryweather (71 Keys) + Bubbling Bomber's Bucket Hat (11 Keys)

https://backpack.tf/profiles/76561198082294224#!/compare/1562371200/1562457600

https://backpack.tf/profiles/76561198131555957#!/compare/1562371200/1562457600

71 + 11 - 5 = 77 Keys

Bomber's Mini

https://backpack.tf/suggestion/5d50f30e67807274192b5cc0 - 11 Keys

Sale 10) Sold + 10 Keys + ~6 Keys of Items for a Duped Cloudy Moon Killer's Kabuto (81.5 Keys)

https://backpack.tf/profiles/76561198131555957#!/compare/1562803200/1562889600

https://backpack.tf/profiles/76561198046393528#!/compare/1562803200/1562889600

81.5 - 16 = 65.5, which rounds to 66 Keys

Kabuto Mini

https://backpack.tf/profiles/76561198053252981#!/compare/1564876800/1564963200 - Sold for 75 Keys

https://backpack.tf/profiles/76561198079182224#!/compare/1564099200/1564272000 - Sold for 88 Keys

https://backpack.tf/profiles/76561198112516663#!/compare/1563840000/1564012800 - Sold for 85 Keys

https://backpack.tf/profiles/76561198119276467#!/compare/1563062400/1563321600 - Sold for 80 Keys

Sale 11) Sold for a Circling Heart Tough Stuff Muffs (63 Keys)

https://backpack.tf/profiles/76561198046393528#!/compare/1563580800/1563753600

Rounding to 65 Keys for cleanliness.

Muffs Mini

https://backpack.tf/profiles/76561198098330939#!/compare/1563667200/1564099200 - Sold for 60 Keys

https://backpack.tf/profiles/76561198400537562#!/compare/1560384000/1560470400 - Sold for 61 Keys

https://backpack.tf/profiles/76561198165205268#!/compare/1560816000/1560902400 - Sold for 65 Keys

https://marketplace.tf/items/tf2/984;5;u19 - Sold for $223 (high), $85.01(47 Keys), $179.99 (high), $84.71 (46 Keys), and $120 (66 Keys)

Taking the conservative 60 - 66 price for the Muffs.