Item 1:

https://backpack.tf/item/11880286079

Sale 1:

Sold for 36 Keys (Unusual ID: "14868772304")

https://backpack.tf/profiles/76561198075435735#!/compare/1725321600/1725408000

https://backpack.tf/profiles/76561199491928185#!/compare/1725321600/1725667200

//

Item 2:

https://backpack.tf/item/11821089536

Sale 2:

Untraceable

https://backpack.tf/profiles/76561199084784906#!/compare/1721779200/1721865600

https://backpack.tf/profiles/76561198050444933#!/compare/1721692800/1721865600

//

Item 3:

https://backpack.tf/item/10867266447

Sale 3:

16 Keys traceable (likely incomplete)

https://backpack.tf/profiles/76561199026390261#!/compare/1723507200/1723593600

https://backpack.tf/profiles/76561198977721610#!/compare/1723507200/1723593600

Sale 4:

Likely bulk

https://backpack.tf/profiles/76561198977721610#!/compare/1723507200/1723593600

https://backpack.tf/profiles/76561198091502579#!/compare/1723507200/1723593600

//

Item 4 + 5:

https://backpack.tf/item/13073062846 - Mannco

https://backpack.tf/item/12336198639 - withdrawn

//

Item 6:

https://backpack.tf/item/10763731924

Skipping gambling

Sale 5:

https://marketplace.tf/items/tf2/31215;5;u202

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

$79.99/1.87 = ~43 Keys (Sep 7)

//

Item 7:

https://backpack.tf/item/14914428663

Sale 6:

Sold for 32 Keys (Unusual ID: "14956847802")

https://backpack.tf/profiles/76561199177132803#!/compare/1727481600/1727568000

https://backpack.tf/profiles/76561198133862771#!/compare/1727481600/1727740800

Sale 7:

Dumped to STN

https://backpack.tf/profiles/76561198133862771#!/compare/1727740800/1727913600

https://backpack.tf/profiles/76561199564942025#!/compare/1728086400/1728172800

Sale 8:

Sold for ~28 Keys (Unusual ID: "14992834641")

https://backpack.tf/profiles/76561199564942025#!/compare/1728345600/1728432000

https://backpack.tf/profiles/76561198977721610#!/compare/1728345600/1728432000

//

Total Sales

28, 32, 36, 43

https://imgur.com/Uea3JKf

Excluding 43 due to seller @ 40 (5 months)

Taking 28 - 36 Keys

Unsolds:

https://backpack.tf/item/10745722827 - 40

https://backpack.tf/item/10867266447 - $79.99

https://backpack.tf/item/10964512662 - $99.99