Item 1

https://backpack.tf/item/7287727154

Sale #1

Bulk sale?-

Seller: https://backpack.tf/profiles/76561198120072608#!/compare/1686700800/1686873600

Buyer: https://backpack.tf/profiles/76561198311498888#!/compare/1686787200/1686873600

Item 2

https://backpack.tf/item/7308198397

Seems like transferred from owner to bot from the previous sales of the unusual in the history

Item 3

https://backpack.tf/item/11504483546

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561199365584645#!/compare/1690156800/1692230400

Buyer: https://backpack.tf/profiles/76561198069707880#!/compare/1691452800/1691539200

Item 4

https://backpack.tf/item/12962287492

Sale #3

Sold for 40 keys (the spelled Fast Learner matches with the spelled Essential Accessories, so that leaves the 40 keys for the unusual)-

Seller: https://backpack.tf/profiles/76561198261483133#!/compare/1684886400/1685059200

Buyer: https://backpack.tf/profiles/76561198011134507#!/compare/1684886400/1685059200

Item 5

https://backpack.tf/item/13025391362

Sale #4

Bulk sale-

Seller: https://backpack.tf/profiles/76561198066684198#!/compare/1685059200/1685232000

Buyer: https://backpack.tf/profiles/76561198209640976#!/compare/1684886400/1685145600

Marketplace.tf Sales

https://marketplace.tf/items/tf2/31008;5;u115

MP.TF Sale #1

Sold for $79.99 on June 8, 2023

Keys @ $1.99

79.99/1.99 = 40.19ish keys

MP.TF Sale #2

Sold for $68 on June 12, 2023

Keys @ $1.98

68/1.98 = 34.34ish keys

MP.TF Sale #3

Sold for $79.99 on June 20, 2023

Keys @ $1.98

79.99/1.98 = 40.39ish keys

MP.TF Sale #4

Sold for $79.99 on August 16, 2023

Keys @ $2.05

79.99/2.05 = 39.01ish keys

MP.TF Sale #5

Sold for $79.99 on August 19, 2023

Keys @ $2.02

79.99/2.02 = 39.59ish keys

Sales @ 34, 39, 40, 40, 40, 40

Taking 39-40 here