3 sales

1) With 78 keys in items for duped Burning Flames Trophy Belt (164)

https://backpack.tf/profiles/76561198169939863#!/compare/1577923200/1578009600

https://backpack.tf/profiles/76561198986058690#!/compare/1577923200/1578009600

No mini for duped one; using sales from marketplace

https://marketplace.tf/items/tf2/53;5;u13

1.1. $255/$1.79 ≈ 142 keys

1.2. $340/$1.76 ≈ 193 keys

1.3. $195/$1.77 ≈ 110 keys (low)

1.4. $275.95/$1.77 ≈ 156 keys

Avg price of belt is 164 keys

PDA

https://backpack.tf/stats/Strange/Construction%20PDA/Tradable/Craftable

Milk

https://backpack.tf/stats/Collector's/Mad%20Milk/Tradable/Craftable

Pistol

https://marketplace.tf/items/tf2/773;14;strange;kt-3

Cola

https://backpack.tf/stats/Collector's/Crit-a-Cola/Tradable/Craftable

Mantreads

https://backpack.tf/stats/Collector's/Mantreads/Tradable/Craftable

164 - 15 - 10 - 41 - 4 - 8 = 86

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2) 84 keys

https://backpack.tf/profiles/76561198054198170#!/compare/1577664000/1577836800

https://backpack.tf/profiles/76561198986058690#!/compare/1577750400/1577836800

84

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3) $145/$1.77 ≈ 82 keys

https://marketplace.tf/items/tf2/984;5;u9

82

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Sellers/buyers: https://imgur.com/a/HsxU4nk

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Total: 82, 84, 86.