Mini for another suggestion :P

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Sale #1 - 34 keys 60.44 ref

https://backpack.tf/profiles/76561198021055079#!/compare/1564444800/1564531200

https://backpack.tf/profiles/76561198058784350#!/compare/1564444800/1564531200

Taking 35.4 keys, rounded to 35

Sale #2 - Untrace

https://backpack.tf/profiles/76561198183060018#!/compare/1560643200/1560729600

https://backpack.tf/profiles/76561198146654766#!/compare/1560124800/1563408000

Sale #3 - 27 keys

https://backpack.tf/profiles/76561198153088409#!/compare/1563062400/1563148800

https://backpack.tf/profiles/76561198183060018#!/compare/1562889600/1563148800

Sale #4 - Using there

https://backpack.tf/profiles/76561198153088409#!/compare/1565568000/1565654400

https://backpack.tf/profiles/76561198833312246#!/compare/1565654400/1566777600

Sale #5 - https://marketplace.tf/items/tf2/30067;5;u57 | https://backpack.tf/item/7733256427 | No idea on the b/o

41.11 / 1.84 = 22.5 keys

Sale #6 - https://marketplace.tf/items/tf2/30067;5;u57 | https://backpack.tf/item/7733256427 | No idea on the b/o

64.99 / 1.85 = 35 keys

Sale #7 - SCM

https://backpack.tf/profiles/76561198236206014#!/compare/1561420800/1564099200

https://backpack.tf/profiles/76561198093928117#!/compare/1563494400/1564790400

Sale #8 - 1 for 1 with GE Panama

https://backpack.tf/profiles/76561198037082247#!/compare/1566432000/1566777600

https://backpack.tf/profiles/76561198079127295#!/compare/1566086400/1566432000

Taking 29.5, rounded to 30 keys

Sale #9 - Untrace

https://backpack.tf/profiles/76561198134902030#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198079127295#!/compare/1566518400/1566604800

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Taking 27 - 35 keys

Excluding 23 keys due to possibly being low / could have been a buy order