https://backpack.tf/item/9331401173

11 keys:

https://backpack.tf/profiles/76561197995091849#!/compare/1701820800/1701907200

https://backpack.tf/profiles/76561198018606855#!/compare/1701734400/1702339200

https://backpack.tf/item/7453869909

Dumped to Quicksell.Store, no match:

https://backpack.tf/profiles/76561199093977898#!/compare/1699574400/1702425600

https://backpack.tf/profiles/76561199085116273#!/compare/1699488000/1699574400

9 keys:

https://backpack.tf/profiles/76561199085116273#!/compare/1699660800/1699747200

https://backpack.tf/profiles/76561198280524116#!/compare/1699660800/1699747200

Most likely an account transfer:

https://backpack.tf/profiles/76561198280524116#!/compare/1699747200/1699833600

https://backpack.tf/profiles/76561198029074524#!/compare/1699660800/1699747200

https://marketplace.tf/items/tf2/30840;5;u3044

November 30: $25.91/1.75=14.8 ~15 keys

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

(1.71+1.77+1.73+1.72+1.72+1.8+1.8)/7=1.75

https://backpack.tf/item/9212428292

Bulk (sold their whole bp):

https://backpack.tf/profiles/76561198133955369#!/compare/1703721600/1704585600

https://backpack.tf/profiles/76561197966756586#!/compare/1704499200/1704585600

https://backpack.tf/item/5938050384

Dumped to STN, no match:

https://backpack.tf/profiles/76561198425250397#!/compare/1702512000/1705968000

https://backpack.tf/profiles/76561199581722058#!/compare/1705881600/1706659200

8 keys, 22.33 ref was added on seller's side so the sale rounds down to 7.5 keys:

https://backpack.tf/profiles/76561199581722058#!/compare/1706054400/1706140800

https://backpack.tf/profiles/76561198308125259#!/compare/1706054400/1706140800

~~

https://backpack.tf/item/9331401173 Seller at 12 keys for 2 years is actually a bug, the listed seller doesn't own their one anymore.

Sales at 7.5, 9, 11, 15.

15 looks out of place next to the other sales given it's fairly far apart compared to the rest, it's also a cash sale.

Sticking with 7.5-11 keys