Only using past 2 months.

Sale #1:

https://backpack.tf/profiles/76561198267589362#!/compare/1548547200/1549152000

Sold for 6.5 keys

6.5 keys

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Sale #2:

https://backpack.tf/profiles/76561198267589362#!/compare/1548374400/1548460800

Unsure.

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Sale #3:

https://backpack.tf/profiles/76561198156375472#!/compare/1548374400/1548460800

???

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Sale #4:

https://backpack.tf/profiles/76561198112516663#!/compare/1548028800/1548201600

Bulk.

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Sale #5:

https://backpack.tf/profiles/76561198112516663#!/compare/1547942400/1548028800

???

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Sale #6:

https://backpack.tf/profiles/76561198327837250#!/compare/1547942400/1548028800

Bulk.

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Sale #7:

https://backpack.tf/profiles/76561198327837250#!/compare/1547856000/1547942400

???

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Sale #8:

https://backpack.tf/profiles/76561198155512809#!/compare/1549929600/1550361600

Untracable.

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Sale #9:

https://backpack.tf/profiles/76561198094559788#!/compare/1549756800/1549843200

Sold for 8 keys.

8 keys

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Sale #10:

https://backpack.tf/profiles/76561198162277492#!/compare/1549497600/1549584000

Untracable.

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Sale #11:

https://backpack.tf/profiles/76561198059194466#!/compare/1548892800/1549238400

Sold for 7 keys and 20 refined

7.5 keys

Quickbuyers are starting at 7 keys 20 ref, not using in the range.