Item 1:

https://backpack.tf/item/15032442919

Sale 1:

Sold for 205 Keys (Item ID: "15699503979")

https://backpack.tf/profiles/76561198068640262#!/compare/1746144000/1746230400

https://backpack.tf/profiles/76561198139404261#!/compare/1741478400/1746230400

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Item 2:

https://backpack.tf/item/2866860637

Sale 2:

Sold for 220 Keys

https://backpack.tf/profiles/76561198068640262#!/compare/1746489600/1746576000

https://backpack.tf/profiles/76561199013362182#!/compare/1746489600/1746576000

Sale 3:

Bulk for Stormy 13th Hour Doctor's Sack

https://backpack.tf/profiles/76561199013362182#!/compare/1748563200/1748649600

https://backpack.tf/profiles/76561198058356352#!/compare/1748563200/1748649600

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Item 3:

https://backpack.tf/item/2385235394

Sale 4:

Bulk

https://backpack.tf/profiles/76561198243128080#!/compare/1741737600/1743552000

https://backpack.tf/profiles/76561198056793885#!/compare/1741651200/1741824000

Sale 5:

Untraceable

https://backpack.tf/profiles/76561198056793885#!/compare/1746835200/1747267200

https://backpack.tf/profiles/76561198060126263#!/compare/1747008000/1747094400

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Item 4:

https://backpack.tf/item/3190632574

Sale 6:

Bulk

https://backpack.tf/profiles/76561198205194977#!/compare/1742169600/1742256000

https://backpack.tf/profiles/76561198140559064#!/compare/1742169600/1742256000

Sale 7:

Sold for 220 Keys

https://backpack.tf/profiles/76561198140559064#!/compare/1743206400/1743379200

https://backpack.tf/profiles/76561198143867628#!/compare/1741132800/1743465600

Sale 8:

Untraceable

https://backpack.tf/profiles/76561198143867628#!/compare/1743897600/1743984000

https://backpack.tf/profiles/76561198060126263#!/compare/1743897600/1743984000

//

Item 5:

https://backpack.tf/item/2812282101

Sale 9:

Bulk for Demonflame Vive La France

https://backpack.tf/profiles/76561198139410003#!/compare/1743897600/1744156800

https://backpack.tf/profiles/76561198285371555#!/compare/1743724800/1743897600

Sale 10:

Bulk

https://backpack.tf/profiles/76561198285371555#!/compare/1743724800/1743897600

https://backpack.tf/profiles/76561197982127154#!/compare/1743811200/1743897600

//

Item 6:

https://backpack.tf/item/2463868056 — Duped history, no sale

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Marketplace.TF Sales:

https://marketplace.tf/items/tf2/35;14;kt-1

https://marketplace.tf/items/tf2/35;14;kt-3

https://marketplace.tf/items/tf2/5021;6

Sale 11:

$399.99/$1.86 = ~215 Keys (Mar 15)

Sale 12:

$499.99/$1.91 = ~262 Keys (Apr 13)

//

Total Sales

205, 215, 220, 220, 262

https://imgur.com/vOtsnqR

Despite seller @ 205, there are too many higher sales to exclude all sales above 205

Taking 205 — 220 Keys

Unsolds:

https://backpack.tf/item/5448302976 — 205

https://backpack.tf/item/2866860637 — 220

https://backpack.tf/item/2812282101 — $414.99

https://backpack.tf/item/2594537888 — $414.99