I like Wool

Keeps you warm

Sellers: - https://gyazo.com/14dee8c06211402f2c4329210a7a6480

https://backpack.tf/item/5394677760 - 7 days @ 165 keys

https://backpack.tf/item/9188791922 - 4 days @ 165 keys

Sale 1)

https://backpack.tf/profiles/76561198002492237#!/compare/1601078400/1601251200

https://backpack.tf/profiles/76561198014103202#!/compare/1601078400/1601251200 - Possibly 75/80 keys, histories don't match

Buyout was 119 keys https://bot.tf/stats/listings/MV61717V so it would've been a quicksell if the keys matched

Sale 2)

https://backpack.tf/profiles/76561198038899317#!/compare/1600992000/1601078400

https://backpack.tf/profiles/76561197996095002#!/compare/1600992000/1601078400 - Sold with a Collector's Professional Killstreak Amputator (13.5) for an Orbiting Planets Pyromancer's Mask (122.5) = 109 keys

Buyout was 130 keys https://bot.tf/stats/listings/4KVX3P2X

Mini for Amputator:

https://marketplace.tf/items/tf2/304;14;kt-3;festive

$24.99 / $1.85 = 13.5 keys

$14.44 seems low

Sale 3)

https://backpack.tf/profiles/76561198002492237#!/compare/1600992000/1601078400

https://backpack.tf/profiles/76561197996095002#!/compare/1600992000/1601078400 - Sold with 10 keys for a Haunted Phantasm Jr Neckwear Headwear (132.5) = 123 keys

Sale 4)

https://backpack.tf/profiles/76561198054825186#!/compare/1600300800/1600387200

https://backpack.tf/profiles/76561198038899317#!/compare/1600214400/1600300800 - Sold for a Strange Festivized Professional Killstreak Australium Medi Gun (~79 at time of sale https://bot.tf/stats/listings/MGL6NDQW) + a Strange A Brush with Death (~16 at time of sale https://bot.tf/stats/listings/Y3WKVL6R) = 86 keys

No buyout

https://backpack.tf/item/5394677760 - Tradebacks

Sales:

86, 109 and 123

Rounding for neatness

Thanks =)