Here goes my second ever suggestion!

1. 23 keys 10 ref - 25/03/23

compare - person didn't update inventory so no compare

item history - https://backpack.tf/item/4257680207

classifieds on that day - https://gladiator.tf/time-machine?item=Marigold+Ritual+Taunt%3A+Zoomin%27+Broom&at=2023-03-25T07%3A30%3A00.000Z

Image proof - https://i.imgur.com/AU397Xg.png

2. untraceable, couldn't get response from owner - 14/04/23

compare - https://backpack.tf/profiles/76561198127253679#!/compare/1681430400/1681516800

item history - https://backpack.tf/item/9578645119

classifieds on that day - https://gladiator.tf/time-machine?item=Marigold+Ritual+Taunt%3A+Zoomin%27+Broom&at=2023-04-14T12%3A35%3A00.000Z

3. 28 keys - 20/04/23

compare - https://backpack.tf/profiles/76561199192607141#!/compare/1681948800/1682035200 with ID 12933103284

item history - https://backpack.tf/item/4714435145

classifieds on that day - https://gladiator.tf/time-machine?item=Marigold+Ritual+Taunt%3A+Zoomin%27+Broom&at=2023-04-20T12%3A35%3A00.000Z

4. untraceable, bulk for Harvest Moon Pugilist's Protector? - 22/04/23

compare - https://backpack.tf/profiles/76561198140316312#!/compare/1682035200/1682121600

item history - https://backpack.tf/item/12218752346

5. 27 keys in cash at 27*1.93=52.11 USD - 03/05/23

compare - https://backpack.tf/profiles/76561198116427955#!/compare/1682467200/1683072000

item history - https://backpack.tf/item/4277153760

Image proof - https://i.imgur.com/BcLFkSK.png

sellers forum post - https://forums.backpack.tf/topic/80125-selling-tf2-keys-for-192-wisecrypto-%E2%9C%85-100-trust/#comment-662572

+Trust on sellers profile from jury - https://backpack.tf/trust/76561198306145097

6. 25 keys 4.77 ref - My own purchase - 08/05/23

compare - https://backpack.tf/profiles/76561198096144879#!/compare/1683417600/1683504000

item history - https://backpack.tf/item/6424448225

Proof of trade - https://lensdump.com/i/EafEmk

proof of trade offer - https://lensdump.com/i/Eaf1Fa

7. 17 keys + Fountain of Delight Taunt: The Trackman's Touchdown + Holy Grail Taunt: Zoomin' Broom - Total sale value ~24 keys - 09/05/23

https://gladiator.tf/sales?item=Fountain+of+Delight+Taunt%3A+The+Trackman%27s+Touchdown - 3 sold at ~1 key, 35 ref

https://gladiator.tf/sales?item=Holy+Grail+Taunt%3A+Zoomin%27+Broom - 2 sold at 5 keys, 36 ref

compare - https://backpack.tf/profiles/76561198139444147#!/compare/1683590400/1683676800

image proof - https://i2.lensdump.com/i/kgcBxz.png and https://i.lensdump.com/i/kgXuXT.png

item history - https://backpack.tf/item/4277001548

classifieds on that day - https://gladiator.tf/time-machine?item=Marigold+Ritual+Taunt%3A+Zoomin%27+Broom&at=2023-05-09T12%3A35%3A00.000Z

8. 39 keys cash sale for 79.99 USD (79.99/2.04=39.21) on marketplace.tf - 13/05/23 - Pretty big outlier so didn't include

https://marketplace.tf/items/tf2/30672;5;u3088

price of keys on that day - ~2.04 - https://i.imgur.com/b7qWQ8y.png

image proof - https://i.imgur.com/hj3c0is.png

Sales outside of time range/unusable (not used) -

9. 60$ on mannco - 30/03/23

compare - https://backpack.tf/profiles/76561198129148160#!/compare/1680134400/1680220800

Item history - https://backpack.tf/item/12261608789

Image proof - https://i.imgur.com/sFH15Hy.png

10. 29 keys - 19/02/23

compare - https://backpack.tf/profiles/76561199059160806#!/compare/1676678400/1676764800

item history - https://backpack.tf/item/12180200201

classifieds on that day - https://gladiator.tf/time-machine?item=Marigold+Ritual+Taunt%3A+Zoomin%27+Broom&at=2023-02-18T12%3A35%3A00.000Z

11. 23 keys 80 ref/24 keys - 22/02/23

compare - https://backpack.tf/profiles/76561198045296162#!/compare/1677024000/1677196800

item history - https://backpack.tf/item/12233490169

classifieds on that day - https://gladiator.tf/time-machine?item=Marigold+Ritual+Taunt%3A+Zoomin%27+Broom&at=2023-02-22T13%3A35%3A00.000Z