Mini.

Huge credits to Scourge for minis on the Cold Killer, Grimm Hatte and Helmet Without a Home, and overall for always being down to help. Couldn't have done this without him. less than three

Sale 1: https://backpack.tf/profiles/76561198163195118#!/compare/1580688000/1581292800

https://backpack.tf/profiles/76561198305494036#!/compare/1580601600/1580688000

No clue.

Sale 2: https://backpack.tf/profiles/76561198305676157#!/compare/1581811200/1581897600

https://backpack.tf/profiles/76561198042055185#!/compare/1581811200/1581897600

Manually counting, i got 28 keys.

Additional by the King:

DBD Uber (buyers at 27) + 1 key it seems

https://backpack.tf/profiles/76561198157323044#!/compare/1583020800/1584576000

https://backpack.tf/profiles/76561198305494036#!/compare/1582934400/1583020800

https://bot.tf/stats/listings/YDLGGX2X ----- B/O was 28 as well

~23 keys? Something else had to be involved

https://backpack.tf/profiles/76561198305676157#!/compare/1583020800/1583107200

https://backpack.tf/profiles/76561198223429284#!/compare/1583020800/1583107200

Minis needed, but should be close to 40

https://backpack.tf/profiles/76561198223429284#!/compare/1583193600/1583280000

https://backpack.tf/profiles/76561198383339557#!/compare/1583193600/1583366400

https://bot.tf/stats/listings/M17JOR7O ----- B/O was 50

https://marketplace.tf/items/tf2/981;5;u57 ----- CK sales here

Sold for Terror-Watt Cold Killer (18.5 keys) + Dead Presidents Grimm Hatte (10 keys) + Cloud 9 Helmet Without a Home (7.5 keys)

18.5 + 10 + 7.5 = 36

Mini for the Cold Killer: https://backpack.tf/suggestion/5e816ed5ab22c46b187a40d2

Buyers at 28+ now, so a range with the above sale will be fine.

Classies: https://i.imgur.com/oxd7WPD.png. Killua started at 32 on 9th of february: https://bot.tf/stats/listings/M0D6VR3X. And so it shall be, 28-36!