As you wish.

1) 58 keys

https://backpack.tf/profiles/76561198118235963#!/compare/1563148800/1563235200

https://backpack.tf/profiles/76561198128953533#!/compare/1562976000/1563235200

Low.

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2) ?

https://backpack.tf/profiles/76561198118235963#!/compare/1562803200/1562889600

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3) ?

https://backpack.tf/profiles/76561198412759781#!/compare/1562716800/1562803200

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4) Green Energy Tundra Top (79)

https://backpack.tf/profiles/76561198046393528#!/compare/1562544000/1562630400

https://backpack.tf/profiles/76561198412759781#!/compare/1562544000/1562630400

Tundra mini:

4.1) Miami Nights Tundra Top (43) + Neutron Star Deep Cover Operator (42)

https://backpack.tf/profiles/76561198170098378#!/compare/1562544000/1562716800

https://backpack.tf/profiles/76561198046393528#!/compare/1562630400/1562716800

Tundra sold for $77.66 on June 12th, keys were at $1.81

https://marketplace.tf/items/tf2/30976;5;u61

77.66/1.81 ≈ 43 keys

Operator sold for $75 on May 3rd, keys were at $1.8

https://marketplace.tf/items/tf2/30375;5;u107

75/1.8 ≈ 42 keys

43 + 42 = 85

4.2) 82 keys

https://backpack.tf/profiles/76561198031448782#!/compare/1558828800/1559692800

4.3) $150 on June 25th, keys were at $1.83

https://marketplace.tf/items/tf2/30976;5;u9

150/1.83 ≈ 82 keys

Sales on GE Tundra: 82, 82, 85. There are 2 sellers at 74 and 75... So, 74-85

79

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5) 58 keys

https://backpack.tf/profiles/76561198069137737#!/compare/1561852800/1561939200

Low.

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6) ?

https://backpack.tf/profiles/76561198173088631#!/compare/1560643200/1561334400

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Sellers/buyers: https://imgur.com/a/ho4JtI7

Total: 58, 58, 70, 79. It became even higher than 70 although there is a seller for 68. So 70 is more accurate than 70-79, isn't it? If you want, you can help me with finding other sales on scorching helmet (or just give me the histories of hats)