Month 1 https://gladiator.tf/sales?item=Restless%20Wraiths%20Spooky%20Head-Bouncers&at=2022-05-18T00:27:01.773Z

1 @ 17 keys 18.22 ref

2 @ 17 keys 19.88 ref

1 @ 19 keys

1 @ 20 keys 50 ref

1 @ 22 keys

Month 2 https://gladiator.tf/sales?item=Restless%20Wraiths%20Spooky%20Head-Bouncers&at=2022-04-18T00:27:01.773Z

2 @ 16 keys 62.77 ref

2 @ 17 keys 8.44 ref

1 @ 17 keys 34 ref

4 @ 17 keys 34.33 ref

1 @ 18 keys

1 @ 19 keys

1 @ 20 keys 35 ref

Month 3 https://gladiator.tf/sales?item=Restless%20Wraiths%20Spooky%20Head-Bouncers&at=2022-03-18T00:27:01.773Z

1 @ 16 keys 55 ref

1 @ 16 keys 57.88 ref

1 @ 16 keys 61.66 ref

https://marketplace.tf/items/tf2/31209;5;u193

$48.49 / $1.75 = 27.71 keys

https://mannco.store/item/440-restless-wraiths-unusual-spooky-head-bouncers

$43.79 / $1.60 = 27.37 keys

$30 / $1.59 = 18.87 keys

https://backpack.tf/item/11515547820

https://gladiator.tf/time-machine?item=Restless%20Wraiths%20Spooky%20Head-Bouncers&at=2022-05-02T11:40:51.000Z

~19 keys

https://backpack.tf/item/11313787946

https://gladiator.tf/listings/623e010837149aa9540c420f

~18 keys

https://backpack.tf/profiles/76561198883923232#!/compare/1649635200/1649721600

https://backpack.tf/profiles/76561198870467412#!/compare/1649635200/1649721600

~18 keys

https://backpack.tf/profiles/76561198870467412#!/compare/1651536000/1651622400

https://backpack.tf/profiles/76561198073022488#!/compare/1651449600/1652400000

18 keys

https://backpack.tf/profiles/76561197991710013#!/compare/1647561600/1647648000

https://gladiator.tf/listings/62362b6d2a301cc66f45a7e3

~19 keys?

https://backpack.tf/profiles/76561198191218818#!/compare/1646352000/1646438400

19 keys

https://backpack.tf/profiles/76561198242646048#!/compare/1645833600/1646352000

20 keys

Classies: https://gladiator.tf/time-machine?item=Restless%20Wraiths%20Spooky%20Head-Bouncers&at=2022-05-18T00:39:26.344Z

Buyers ~17, sellers ~19-21+

Going with 17 - 21 keys.