my first suggestion with more than two sales, so go easy on me lol

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sale #1 - untrace/bulk

buyer - https://backpack.tf/profiles/76561198112281935#!/compare/1643932800/1644105600

seller - https://backpack.tf/profiles/76561198244616108#!/compare/1644105600/1644278400 (i really hope it wasn't four keys)

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sale #2 - 30 pure

buyer - https://backpack.tf/profiles/76561199215748094#!/compare/1644105600/1644278400

seller - https://backpack.tf/profiles/76561198112281935#!/compare/1644192000/1644278400 (30 key cluster traces to buyer)

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sale #3 - bulk (supports range imo)

buyer - https://backpack.tf/profiles/76561199039349282#!/compare/1644537600/1644624000

seller - https://backpack.tf/profiles/76561199215748094#!/compare/1644105600/1644278400

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sale #4 - 31 (buyer shows 35, but seller compare is MUCH cleaner)

buyer - https://backpack.tf/profiles/76561199153055822#!/compare/1644710400/1644796800

seller - https://backpack.tf/profiles/76561199039349282#!/compare/1644710400/1644796800

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sale #5 - 31

buyer - https://backpack.tf/profiles/76561198285385979#!/compare/1644796800/1644969600

seller - https://backpack.tf/profiles/76561199153055822#!/compare/1644796800/1644969600

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sale #6 - 32 keys (no more icky compares :D)

dreaded > shady - https://gyazo.com/34c0989837996da810dccb822a86b9eb

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sale #7 - 55 keys

shady > bajiro - https://gyazo.com/4ce6a5a50be982397cbb1583d45387c2

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pure sales at 30, 31, 31, 32, 55

item sale #3 seems to favor lower range

going with 30 - 32

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this is my first large suggestion, so feel free to leave feedback :)