2-year-old price, need a refresh! Not because I bought it as a gift for a friend <3

Credits to Lemon for helpful info.

Sale 1 - mplc.tf sale

https://marketplace.tf/items/tf2/920;5;u11

Sold on Jan 10, 2022. The average key price of that day was 1.83, so it's 139/1.83=75.95, taking 76.

Item: https://backpack.tf/item/10496128993

Sale 2

https://backpack.tf/profiles/76561198116790230#!/compare/1640304000/1640476800

https://backpack.tf/profiles/76561198159464344#!/compare/1640217600/1640390400

Not sure what's going on here.

Sale 3

https://backpack.tf/profiles/76561198453530349#!/compare/1638057600/1638144000

Untraceable.

Item: https://backpack.tf/item/9937921774

Sale 4

https://backpack.tf/profiles/76561198337734785#!/compare/1644105600/1644192000

Untraceable.

Item: https://backpack.tf/item/7039057076

Sale 5

https://backpack.tf/profiles/76561198841279602#!/compare/1638057600/1638144000

Untraceable.

Item: https://backpack.tf/item/10404403763

Sale 6

https://backpack.tf/profiles/76561198154799999#!/compare/1640217600/1640563200

Again I don't know what's going on.

Item: https://backpack.tf/item/11181735763

Sale 7

https://backpack.tf/profiles/76561198072986766#!/compare/1644278400/1644364800

https://backpack.tf/profiles/76561198132113819#!/compare/1644278400/1644364800

Flamongo said it was somewhere between 72-74, but it's a bulk sale, so excluding.

Sale 8

https://gyazo.com/988049b9a8b5de047aea2f2fe27d1167

81 keys. Bought by me.

Taking 76-81 as final result.