Sale #1, Jul 4th:

Seller: https://backpack.tf/profiles/76561198065030763#!/compare/1562112000/1562284800

Buyer: https://backpack.tf/profiles/76561198129714607#!/compare/1562112000/1562198400

<50%, excluding

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Sale #2, Jul 6th:

Seller: https://backpack.tf/profiles/76561198065030763#!/compare/1562284800/1562371200

Buyer: https://backpack.tf/profiles/76561198055847835#!/compare/1562284800/1562371200

12 keys

Quicksale, excluding

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Sale #3, Jun 22nd:

Seller: https://backpack.tf/profiles/76561198230964868#!/compare/1561075200/1561161600

Buyer: https://backpack.tf/profiles/76561198267189538#!/compare/1561075200/1561161600

18 keys

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Sale #4, Jul 7th:

Seller: https://backpack.tf/profiles/76561198055847835#!/compare/1562371200/1562457600

Buyer: https://backpack.tf/profiles/76561198055847835#!/compare/1562371200/1562457600

The one removed from the buyer is another one from sale #3.

20 keys

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Sale #5, Jul 8th:

Seller: https://backpack.tf/profiles/76561198074149928#!/compare/1562457600/1562544000

Buyer: https://backpack.tf/profiles/76561197994697258#!/compare/1562457600/1562544000

Bulk quicksale, excluding

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Taking 18-20