Month 1 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20High%20Five!&at=2022-08-23T21:30:54.646Z

1 @ 11 keys 24.77 ref

1 @ 11 keys 37.88 ref

1 @ 11 keys 40.11 ref

1 @ 11 keys 43.66 ref

1 @ 12 keys 50 ref

1 @ 13 keys

2 @ 14 keys

1 @ 15 keys

Month 2 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20High%20Five!&at=2022-07-23T21:30:54.646Z

1 @ 10 keys 60.55 ref

1 @ 11 keys 13.11 ref

1 @ 12 keys 21 ref

1 @ 15 keys

Month 3 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20High%20Five!&at=2022-06-23T21:30:54.646Z

1 @ 10 keys 47.33 ref

1 @ 10 keys 52.66 ref

1 @ 14 keys

https://marketplace.tf/items/tf2/167;5;u3005

Sales at 16+ appear high relative to pure sales

https://mannco.store/item/440-fountain-of-delight-unusual-taunt-the-high-five

$25 / $1.67 = 14.97 keys

$21 / $1.70 = 12.35 keys (x2)

$24 / $1.69 = 14.20 keys

Classies: https://gladiator.tf/time-machine?item=Fountain%20of%20Delight%20Taunt:%20The%20High%20Five!&at=2022-08-24T09:09:12.978Z

Despite sales at ~11, numerous buyers up to ~12 suggest those should now be excluded. Unsolds at 14 suggest sales at 15 should be excluded too.

Taking 12 - 14 keys.