Using last 2 months.

Sale 1:

Sold for 7 keys

https://backpack.tf/profiles/76561199157485240#!/compare/1699142400/1699574400

https://backpack.tf/profiles/76561199553070078#!/compare/1699574400/1699660800

https://backpack.tf/item/12358023822

= 7 keys

Sale 2:

Sold for 6 keys + 11 ref

https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Dueling%20Banjo&at=2023-12-04T06:26:26.017Z

https://backpack.tf/profiles/76561199197624825#!/compare/1701475200/1701561600

https://backpack.tf/profiles/76561198088316707#!/compare/1701475200/1701561600

https://backpack.tf/item/11925320258

= ~6.2 keys

Other Sales:

https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Dueling%20Banjo&at=2023-11-24T06:26:26.017Z - Not labelled here, may not have sold to a buy order.

https://backpack.tf/profiles/76561198105247760#!/compare/1697155200/1697846400

https://backpack.tf/profiles/76561199197624825#!/compare/1697760000/1697846400

https://backpack.tf/item/11925320258

Untraceable

https://backpack.tf/profiles/76561199085116273#!/compare/1699056000/1699142400

https://backpack.tf/profiles/76561198202572818#!/compare/1698969600/1699142400

https://backpack.tf/item/10327362985

Untraceable/bulk. Ignored trades between bots prior to this sale.

https://backpack.tf/profiles/76561199072654974#!/compare/1701302400/1701388800

https://backpack.tf/profiles/76561199199747687#!/compare/1701302400/1701388800

https://backpack.tf/item/7889100260

Untraceable. 1 key matches.

https://backpack.tf/profiles/76561199229507964#!/compare/1700697600/1700956800

https://backpack.tf/profiles/76561199059698603#!/compare/1700697600/1700784000

https://backpack.tf/item/13787528110

Untraceable/bulk.

https://backpack.tf/profiles/76561199192607141#!/compare/1700006400/1700092800

https://backpack.tf/profiles/76561199099521803#!/compare/1700006400/1700092800

https://backpack.tf/item/13185511199

Untraceable/bulk.

https://backpack.tf/profiles/76561199099521803#!/compare/1700179200/1700265600

https://backpack.tf/profiles/76561198802638520#!/compare/1701302400/1701388800

https://backpack.tf/item/13185511199

Untraceable, most likely missing info from history.

https://backpack.tf/item/6318066950 - Suspected scammer alt, not looking at these trades.

https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Dueling%20Banjo&at=2023-12-02T06:37:45.001Z - Untraceable purchase at ~6 keys.

Sellers/buyers:

https://imgur.com/a/Kk58cnL

https://backpack.tf/item/13787528110 - ~6.6 keys, 23 days

https://backpack.tf/item/6318066950 - ~6.6 keys,

https://backpack.tf/item/8358855269 - 7 keys, 16 days

Sales at:

6.2 keys

7 keys

6.2 rounds down to 6 here. Sellers are lower than the 7 key sale, so we shouldn't exclude the 6 key sale due to the buyer at 6. The other Gladiator sale at ~6 keys supports the inclusion of 6 keys.

Taking 6-7 keys.