History 1: https://backpack.tf/item/10348856161

https://marketplace.tf/items/tf2/31190;5;u35

$19.99 / $1.83 = 10.92 keys ~11 keys

History 2: https://backpack.tf/item/10424596806

10 keys - 48 ref, rounds to 9.5 keys:

https://backpack.tf/profiles/76561198101339909#!/compare/1643932800/1644192000

https://backpack.tf/profiles/76561198112736221#!/compare/1644105600/1647043200

History 3: https://backpack.tf/item/10671100000

Untrace:

https://backpack.tf/profiles/76561198311498888#!/compare/1645056000/1645142400

https://backpack.tf/profiles/76561198993873071#!/compare/1645142400/1645228800

Untrace (the Near ID matches the TW Dread Knot matches but histories don't match and it also doesn't show in the other compare, so I doubt it was involved)

https://backpack.tf/profiles/76561198993873071#!/compare/1645228800/1645315200

https://backpack.tf/profiles/76561199060636893#!/compare/1644710400/1645315200

History 4: https://backpack.tf/item/10723432784

Untrace:

https://backpack.tf/profiles/76561199111658162#!/compare/1640649600/1640736000

https://backpack.tf/profiles/76561198055093291#!/compare/1640649600/1640736000

Untrace:

https://backpack.tf/profiles/76561198055093291#!/compare/1640649600/1640736000

https://backpack.tf/profiles/76561198114112130#!/compare/1639872000/1640908800

https://backpack.tf/item/10331454662 unsold at 10 keys for 28 days

11 looks a bit high given the unsold, taking 9.5 flat