Month 1 https://gladiator.tf/sales?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-10T22:44:08.392Z

1 @ 13 keys

Month 2 https://gladiator.tf/sales?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-05-10T22:44:08.392Z

2 @ 11 keys 1.44 ref

Month 3 https://gladiator.tf/sales?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-04-10T22:44:08.392Z

1 @ 10 keys 18.55 ref

2 @ 14 keys

https://marketplace.tf/items/tf2/31209;5;u202

$29.99 / $1.77 = 16.94 keys

$29.99 / $1.75 = 17.14 keys

https://mannco.store/item/440-frantic-spooker-unusual-spooky-head-bouncers

$22.95 / $1.61 = 14.25 keys

Two recent listings at ~12 keys

https://gladiator.tf/time-machine?item=Frantic+Spooker+Spooky+Head-Bouncers&at=2022-06-06T05%3A29%3A00.000Z

most likely sold at ~12

Classies: https://gladiator.tf/time-machine?item=Frantic+Spooker+Spooky+Head-Bouncers&at=2022-06-10T02%3A07%3A00.000Z

Buyers at ~10, sellers at ~12 and ~29

Including all pure sales with a 10 - 14 key range, ~17 seem like outliers.