Here's all I found

Clean sale:

29 pure

https://backpack.tf/profiles/76561198272076942#!/compare/1559347200/1559433600

https://backpack.tf/profiles/76561198267364698#!/compare/1559347200/1559433600

Dupe sales:

https://marketplace.tf/items/tf2/358;5;u17 // https://backpack.tf/item/2140753702

$56 / $1.84 = 30.43 keys B/O caps at 28 Keys -> https://bot.tf/stats/listings/4RLPWJ54

Untrace

https://backpack.tf/profiles/76561198843047706#!/compare/1562025600/1562198400

https://backpack.tf/profiles/76561198064803486#!/compare/1562025600/1562112000

Dupe Bubbling Tough Stuff Muffs + 1 Key ?? Looks incomplete

https://backpack.tf/profiles/76561198064803486#!/compare/1562025600/1562112000

https://backpack.tf/profiles/76561198095862827#!/compare/1562112000/1562198400

Dupe Bubbling Tough Stuff Muffs - Resold the next day for 25 Keys

https://backpack.tf/profiles/76561198064803486#!/compare/1562198400/1562284800

22 Keys

https://backpack.tf/profiles/76561198079182224#!/compare/1562976000/1563062400

https://backpack.tf/profiles/76561198438525576#!/compare/1562976000/1563062400

21 Keys- 1 key lower than paid for looks weird a day after buying

https://backpack.tf/profiles/76561198438525576#!/compare/1563062400/1563148800

https://backpack.tf/profiles/76561198354979270#!/compare/1563062400/1563148800

Strange Cloud 9 Trash Man + 9 Keys

https://backpack.tf/profiles/76561198354979270#!/compare/1563667200/1563753600

https://backpack.tf/profiles/76561198156334217#!/compare/1563753600/1564099200

Strange Cloud 9 Trash Man sold for Aces High Professor's Peculiarity (11 Keys) + 1.5 Keys

https://backpack.tf/profiles/76561198033282171#!/compare/1564099200/1564358400

Final Price: 11 + 1.5 + 9 = ~ 21.5

28 Keys

https://backpack.tf/profiles/76561198021272428#!/compare/1564272000/1564358400

https://backpack.tf/profiles/76561198031013865#!/compare/1564358400/1564531200

35 Keys

ID match: 7990128349

https://backpack.tf/profiles/76561198031013865#!/compare/1564963200/1565395200

https://backpack.tf/profiles/76561198108331387#!/compare/1564876800/1565222400

Sales at 21/22/22/26/28/28/29/35

Would you be fine with 22-28 or 22-29 ?