Month 1 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Box%20Trot&at=2022-02-16T00:51:42.788Z

1 @ 5 keys 16.44 ref

1 @ 5 keys 16.55 ref

1 @ 5 keys 16.77 ref

1 @ 5 keys 17 ref

1 @ 5 keys 30.11 ref

Month 2 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Box%20Trot&at=2022-01-16T00:51:42.788Z

1 @ 4 keys 53 ref

1 @ 4 keys 53.22 ref

2 @ 4 keys 54.88 ref

2 @ 5 keys

Month 3 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Box%20Trot&at=2021-12-16T00:51:42.788Z

1 @ 5 keys 51.22 ref

1 @ 5 keys 53.33 ref

https://marketplace.tf/items/tf2/30615;5;u3005

$12.99 / $1.83 = 7.10 keys

$12.59 / $1.83 = 6.88 keys

https://mannco.store/item/440-fountain-of-delight-unusual-taunt-the-box-trot

$9.59 / $1.68 = 5.71 keys

$12.99 / $1.66 = 7.83 keys

$12.65 / $1.60 = 7.91 keys

$7.35 / $1.59 = 4.62 keys (x2)

$11 / $1.65 = 6.67 keys (x2)

Classies: https://gladiator.tf/listings/620ccf61e062c52dbfec0442

Sellers down to ~6, buyers up to 5.5

Going with 5.5-6 keys.