The Hot Backwoods Boomstick Shotgun (Field-Tested) - Thanks to Vincentius for proof.

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Sale #1 - 24 keys

https://backpack.tf/profiles/76561198002757046#!/compare/1546646400/1546732800

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Sale #2 - 25 keys

https://backpack.tf/profiles/76561198002757046#!/compare/1546819200/1546905600

https://backpack.tf/profiles/76561198180769950#!/compare/1546732800/1546905600

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Sale #3 - 22 keys (quicksale, so outlier)

https://backpack.tf/profiles/76561198180769950#!/compare/1546905600/1547078400

https://backpack.tf/profiles/76561198002757046#!/compare/1546992000/1547078400

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Sale #4 - Untrace

https://backpack.tf/profiles/76561198002757046#!/compare/1547510400/1547596800

https://backpack.tf/profiles/76561198122445210#!/compare/1547424000/1547596800

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Sale #5 - Bulk

https://backpack.tf/profiles/76561198122445210#!/compare/1548892800/1548979200

https://backpack.tf/profiles/76561198119149660#!/compare/1548892800/1548979200

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Taking 24-25 keys, feel free to comment suggestions.