Credit to El Jezzus and Crust!

Sale 1)

https://backpack.tf/profiles/76561198258937500#!/compare/1721952000/1722124800

https://backpack.tf/profiles/76561198043444428#!/compare/1722038400/1722124800

https://backpack.tf/item/7021332282

Sold with a Dark Doorway Highway Star for a Strange Burning Flames Bonk Boy (Recently priced at 1750 Keys)

Mini for Dark Doorway Highway Star ----- 52

Sale 1a)

https://backpack.tf/profiles/76561198040073503#!/compare/1716076800/1716163200

https://backpack.tf/profiles/76561198818035498#!/compare/1716076800/1716163200

https://backpack.tf/item/7252385523

Untraced

Sale 2a)

https://backpack.tf/profiles/76561198818035498#!/compare/1718841600/1721606400

https://backpack.tf/profiles/76561198038779395#!/compare/1719792000/1721865600

https://backpack.tf/item/7252385523

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Sale 3a)

https://backpack.tf/profiles/76561199389372563#!/compare/1719619200/1719705600

https://backpack.tf/profiles/76561198117597416#!/compare/1719619200/1719705600

https://backpack.tf/item/7250716690

Excluding bot transfers and dumping to bots

Bulk

Sale 4a)

https://backpack.tf/profiles/76561199072654974#!/compare/1721001600/1721088000

https://backpack.tf/profiles/76561197960557008#!/compare/1721001600/1721174400

https://backpack.tf/item/14229032371

Excluding dump to bots

Untraced

Using Buy Orders - 52 keys - https://backpack.tf/classifieds?item=Highway%20Star&quality=5&tradable=1&craftable=1&australium=-1&particle=116&killstreak_tier=0

1750 - 52 = 1698 keys = ~ 1700 keys

Going 1700 Keys Flat!