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.

Blaze:

10 looks low here given the number of buyers at 11 - 12 keys currently

https://gladiator.tf/sales?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-07-09T16:52:54.221Z - also 4 recent sales at 11 - 12 keys.

https://gladiator.tf/sales?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-08-21T14:07:31.927Z - new sale at 16~ keys and multiple buyers at 16~ keys as well atm

New sales:

https://backpack.tf/profiles/76561198114039731#!/compare/1658966400/1661990400

https://backpack.tf/profiles/76561198043834548#!/compare/1659312000/1661904000

?

https://backpack.tf/profiles/76561198050518375#!/compare/1658966400/1659052800

https://backpack.tf/profiles/76561198314776045#!/compare/1658880000/1659052800

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-07-29T10:16:10.000Z

14 keys

https://backpack.tf/profiles/76561198314776045#!/compare/1659571200/1659830400

https://backpack.tf/profiles/76561198311744280#!/compare/1659571200/1659744000

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-08-04T15:09:50.000Z

9 keys match, incomplete (at least 12+)

https://backpack.tf/item/10835987320

Gambling

https://backpack.tf/profiles/76561198143912133#!/compare/1654473600/1654905600

https://backpack.tf/profiles/76561199134603763#!/compare/1654473600/1654905600

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-06T20:11:47.000Z

?

https://backpack.tf/profiles/76561199134603763#!/compare/1654905600/1654992000

https://backpack.tf/profiles/76561199190065455#!/compare/1654905600/1654992000

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-12T04:40:56.000Z

Cursed Confinement Taunt: Panzer Pants (~7 https://backpack.tf/suggestion/6300d20f4217f668230e9108) + ~3 keys = 10 keys

https://backpack.tf/profiles/76561199190065455#!/compare/1654992000/1655078400

https://backpack.tf/profiles/76561198143789627#!/compare/1654905600/1655078400

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-12T05:11:20.000Z

11 keys

https://backpack.tf/profiles/76561198143789627#!/compare/1660348800/1660435200

https://backpack.tf/profiles/76561198376885782#!/compare/1660262400/1660348800

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-08-13T02:29:51.000Z

16 key buy order?

https://backpack.tf/profiles/76561198376885782#!/compare/1660348800/1660435200

https://backpack.tf/profiles/76561198935925371#!/compare/1659571200/1660435200

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-08-14T11:45:50.000Z

12 keys match, incomplete, probably at least 16

https://backpack.tf/profiles/76561198935925371#!/compare/1660953600/1661472000

https://backpack.tf/profiles/76561198846853467#!/compare/1661385600/1661472000

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-08-20T01:53:24.000Z

Refracting Fractals Undercover Brolly (at least 15 keys https://gladiator.tf/sales?item=Refracting%20Fractals%20Undercover%20Brolly&at=2022-09-03T21:16:10.507Z) + 3 keys? = 18 keys

https://backpack.tf/profiles/76561198846853467#!/compare/1661644800/1661731200

https://backpack.tf/profiles/76561198440460554#!/compare/1661385600/1661644800

Head-Bouncers + 1 key for Unusual Taunt: The Victory Lap Unusualifier (~17 https://gladiator.tf/sales?item=Non-Craftable%20Unusual%20Taunt:%20The%20Victory%20Lap%20Unusualifier&at=2022-09-03T21:18:53.865Z), 17 - 1 = 16 keys

https://backpack.tf/profiles/76561198440460554#!/compare/1661644800/1661731200

https://backpack.tf/profiles/76561198862425745#!/compare/1661644800/1661731200

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-08-28T22:10:51.000Z

Seems to be 12 keys, does seem low given classies tho

https://backpack.tf/item/11650114520

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-19T10:11:27.000Z

Likely ~12 keys

->

dump

->

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-29T00:56:40.000Z

Likely ~13 keys

https://backpack.tf/item/10977126354

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-25T09:42:56.000Z

Likely ~13 keys

gladiator dump

QS.store dump

https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-06-28T21:36:25.000Z

Likely ~13 keys

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

New sale at $24.31/1.88 = ~13 keys

https://gladiator.tf/sales?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-09-03T21:25:57.648Z

More sales at ~16 keys

Classies: https://gladiator.tf/time-machine?item=Frantic%20Spooker%20Spooky%20Head-Bouncers&at=2022-09-03T21:27:05.844Z

Buyers back down to ~11 - 12 keys, sellers 18 - 19+ keys

Given the sole sale above 16 was 18 (which involved a new unusual), and the general array of lower sales, I think 11 - 16 keys seems appropriate.