History 1: https://backpack.tf/item/8342616450

9 keys:

https://backpack.tf/profiles/76561197963500354#!/compare/1640131200/1640217600

https://backpack.tf/profiles/76561198089521138#!/compare/1640131200/1640390400

History 2: https://backpack.tf/item/9587833335

Untrace/Dumped to Quicksell.Store:

https://backpack.tf/profiles/76561198052745033#!/compare/1637107200/1644624000

https://backpack.tf/profiles/76561198850178158#!/compare/1637020800/1637107200

History 3: https://backpack.tf/item/10877043814

Untrace:

https://backpack.tf/profiles/76561198009309781#!/compare/1638662400/1638748800

https://backpack.tf/profiles/76561199051096093#!/compare/1638662400/1641859200

~~

https://mannco.store/item/440-thundering-spirit-unusual-taunt-the-dueling-banjo

https://backpack.tf/item/9754536173

https://backpack.tf/item/9659801579

$17 / $1.59 = 10.69 keys ~11 keys

$18.89 / $1.60 = 11.81 keys ~12 keys

https://marketplace.tf/items/tf2/30842;5;u3066

$29.99 / $1.87 = 16.04 keys ~16 keys

$29.99 / $1.82 = 16.48 keys ~16 keys

$29.99 / $1.81 = 16.57 keys ~17 keys

Sales at 9, 11, 12, 16, 16, 17

Seller at 13 https://backpack.tf/item/9587833335

Seller at 15 (4 months) https://backpack.tf/item/6252933615

16-17 looks high. There's currenty a buyer at 10 keys so 9 looks a bit low too.

Gonna go with 11-12 keys with outliers on each side