Sale 1: ~10 Keys Pure.

https://backpack.tf/profiles/76561198264858514#!/compare/1553817600/1554076800

https://backpack.tf/profiles/76561198088999166#!/compare/1553904000/1554076800

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Sale 2: Bulk.

https://backpack.tf/profiles/76561198088999166#!/compare/1554076800/1554163200

https://backpack.tf/profiles/76561198027152204#!/compare/1554076800/1554163200

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Sale 3: Untrace.

https://backpack.tf/profiles/76561198027152204#!/compare/1554163200/1554249600

https://backpack.tf/profiles/76561198830630023#!/compare/1554163200/1554249600

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Sale 4: ~12 Keys.

Sold For Roaring Rockets Taunt: The Jumping Jack (5.25) + Holy Grail Taunt: Disco Fever (5.25) + 1 Key = ~12 (Thank's to erik for the info!)

https://backpack.tf/profiles/76561198830630023#!/compare/1554249600/1554336000

https://backpack.tf/profiles/76561198188896535#!/compare/1554249600/1554336000

Minis:

https://backpack.tf/suggestion/5cd813f1678072192e08e954

https://backpack.tf/suggestion/5cd8146d678072192e08e973

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Sale 5: ~9 Keys Pure. (Quick Sell)

https://backpack.tf/profiles/76561198188896535#!/compare/1554422400/1554508800

https://backpack.tf/profiles/76561198251213118#!/compare/1554249600/1554508800

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Sale 6: ~11 Keys.

Sold For 9 Keys + Taunt: Kazotsky Kick (2)

https://backpack.tf/profiles/76561198251213118#!/compare/1554508800/1554595200

https://backpack.tf/profiles/76561198863716613#!/compare/1554508800/1554595200

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Sale 7: Untrace.

https://backpack.tf/profiles/76561198863716613#!/compare/1554595200/1555113600

https://backpack.tf/profiles/76561198021055079#!/compare/1554508800/1554595200

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Usable Sales: 10/11/12

Going With 10-12 Keys.