There are more transactions to consider. Here's a summary:

Found 10 instances with non-empty history.

[Instance #0]: https://backpack.tf/item/11999711572

[Transaction #0]:

https://backpack.tf/profiles/76561198248558782#!/compare/1655856000/1666915200

no proper comparison found

[Instance #1]: https://backpack.tf/item/11662062161

[Transaction #0]:

no proper comparison found

no proper comparison found

[Transaction #1]:

https://backpack.tf/profiles/76561199199136084#!/compare/1661817600/1661990400

https://backpack.tf/profiles/76561198418937523#!/compare/1661817600/1661904000

Checking for common item ids on both sides of transaction:

[Added]:

Kill-a-Watt Field Practice - 15.52 keys - 1 items

[Removed]:

Mann Co. Supply Crate Key - 1.0 keys - 3 items

Refined Metal - 0.021 keys - 16 items

[Sum added]: 15.52 keys

[Sum removed]: 3.336 keys

[Transaction #2]:

no proper comparison found

https://backpack.tf/profiles/76561198075787741#!/compare/1660608000/1661904000

[Transaction #3]:

https://backpack.tf/profiles/76561198075787741#!/compare/1660521600/1660608000

https://backpack.tf/profiles/76561198850178158#!/compare/1660435200/1660521600

Checking for common item ids on both sides of transaction:

[Added]:

Kill-a-Watt Field Practice - 15.52 keys - 1 items

[Removed]:

[Sum added]: 15.52 keys

[Sum removed]: 0 keys

[Instance #2]: https://backpack.tf/item/11534391415

[Instance #3]: https://backpack.tf/item/9200688459

[Instance #4]: https://backpack.tf/item/8681734619

[Instance #5]: https://backpack.tf/item/6990237774

[Instance #6]: https://backpack.tf/item/6868185285

[Instance #7]: https://backpack.tf/item/6637401059

[Transaction #0]:

https://backpack.tf/profiles/76561198363395191#!/compare/1667088000/1667433600

https://backpack.tf/profiles/76561198035969198#!/compare/1667347200/1667433600

Checking for common item ids on both sides of transaction:

[Added]:

Kill-a-Watt Field Practice - 15.52 keys - 1 items

[Removed]:

[Sum added]: 15.52 keys

[Sum removed]: 0 keys

[Transaction #1]:

https://backpack.tf/profiles/76561198035969198#!/compare/1666742400/1667347200

https://backpack.tf/profiles/76561198329796300#!/compare/1666828800/1667347200

Checking for common item ids on both sides of transaction:

[Added]:

Kill-a-Watt Field Practice - 15.52 keys - 1 items

Kill-a-Watt Heer's Helmet - 18.524 keys - 1 items

[Removed]:

Death at Dusk Ye Oiled Baker Boy - 35.545 keys - 1 items

[Sum added]: 34.044 keys

[Sum removed]: 35.545 keys

[Transaction #2]:

https://backpack.tf/profiles/76561198329796300#!/compare/1666742400/1666828800

https://backpack.tf/profiles/76561199107627144#!/compare/1666742400/1666828800

Checking for common item ids on both sides of transaction:

[Added]:

Kill-a-Watt Field Practice - 15.52 keys - 1 items

[Removed]:

[Sum added]: 15.52 keys

[Sum removed]: 0 keys

[Transaction #3]:

https://backpack.tf/profiles/76561199107627144#!/compare/1665792000/1666137600

https://backpack.tf/profiles/76561198035547951#!/compare/1665964800/1666742400

Checking for common item ids on both sides of transaction:

[Added]:

Kill-a-Watt Field Practice - 15.52 keys - 1 items

[Removed]:

Mann Co. Supply Crate Key - 1.0 keys - 1 items

Reclaimed Metal - 0.0 keys - 2 items

Refined Metal - 0.021 keys - 21 items

[Sum added]: 15.52 keys

[Sum removed]: 1.441 keys

[Transaction #4]:

https://backpack.tf/profiles/76561198035547951#!/compare/1665446400/1665792000

https://backpack.tf/profiles/76561198095293350#!/compare/1665619200/1665792000

Checking for common item ids on both sides of transaction:

[Added]:

Circling Peace Sign Racc Mann - 69.088 keys - 1 items

Cloud 9 Swagman's Swatter - 17.022 keys - 1 items

Kill-a-Watt Field Practice - 15.52 keys - 1 items

[Removed]:

Mann Co. Supply Crate Key - 1 keys - 15 items

[Sum added]: 101.62999999999998 keys

[Sum removed]: 15 keys

[Instance #8]: https://backpack.tf/item/5848202075

[Instance #9]: https://backpack.tf/item/5812739002