Using last 2 months.

Sale 1:

Sold for 3 keys

https://backpack.tf/profiles/76561199389549498#!/compare/1705104000/1705190400 - Near ID: 14045150638

https://backpack.tf/profiles/76561198318924307#!/compare/1703635200/1705449600

https://backpack.tf/item/6259424864

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Buy%20A%20Life&at=2024-01-14T08:43:45.514Z - Gladiator confirms

= 3 keys

Sale 2:

Sold for 2 keys + 38.44 ref

https://backpack.tf/profiles/76561198239945674#!/compare/1705881600/1705968000

https://backpack.tf/profiles/76561199135952616#!/compare/1705795200/1705881600

https://backpack.tf/item/7531266120

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Buy%20A%20Life&at=2024-01-23T08:43:45.514Z - labelled as 2 keys + 38.44 ref (~0.6 keys)

The keys aren't visible on either end, but we can see the exact amount of metal on the seller's end. This should be enough to confirm this sale.

= 2.6 keys

Other Sales:

#1

https://backpack.tf/profiles/76561198258168272#!/compare/1705190400/1705276800

https://backpack.tf/profiles/76561198239945674#!/compare/1705190400/1705276800

https://backpack.tf/item/7531266120

Bulk for Vivid Maddendoktor

#2

https://backpack.tf/profiles/76561199135952616#!/compare/1705968000/1706054400

https://backpack.tf/profiles/76561198856434283#!/compare/1705881600/1706140800

https://backpack.tf/item/7531266120

Untraceable

#3

https://backpack.tf/profiles/76561198995713416#!/compare/1700092800/1705104000

https://backpack.tf/profiles/76561199389549498#!/compare/1705017600/1705104000

https://backpack.tf/item/6259424864

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Buy%20A%20Life&at=2024-01-13T08:43:45.514Z - labelled as 2 keys + 29.11 ref

Untraceable

#4

https://backpack.tf/profiles/76561199192607141#!/compare/1703808000/1703894400

https://backpack.tf/profiles/76561198072250111#!/compare/1703721600/1704240000

https://backpack.tf/item/2992798953

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Buy%20A%20Life&at=2023-12-31T08:43:45.514Z - labelled as 3 keys

Untraceable

#5

https://backpack.tf/profiles/76561198174121615#!/compare/1704931200/1705622400

https://backpack.tf/profiles/76561198040965652#!/compare/1705536000/1705622400

https://backpack.tf/item/2855246719

Backpack buy

#6

https://backpack.tf/profiles/76561198889022746#!/compare/1702166400/1702944000

https://backpack.tf/profiles/76561199085116273#!/compare/1702252800/1702339200

https://backpack.tf/item/2764187972

Untraceable/bulk

#7

https://backpack.tf/profiles/76561199085116273#!/compare/1706313600/1706400000

https://backpack.tf/profiles/76561198072441047#!/compare/1706313600/1706400000

https://backpack.tf/item/2764187972

Bulk for keys

https://backpack.tf/item/13599877098 - gambled

https://backpack.tf/item/2965236177 - gambled

https://marketplace.tf/items/tf2/1108;5;u3003 - 3 marketplace sales this month at $8.99, all are going to be too high, excluding.

Sellers:

https://imgur.com/a/jVYaksO

https://backpack.tf/item/2855246719 - 3 keys

https://backpack.tf/item/2716664936 - ~3.45 keys

https://backpack.tf/item/3679974073 - ~3.45 keys

https://backpack.tf/item/5444186527 - 5 keys

https://backpack.tf/item/9201619841 - marketplace

Sales at:

2.6

3

Weak support for including 2.6 keys, with a single sale to a bot, with bots currently matching the price. If there was another confirmable sale at that price, I'd probably include it. Excluding 2.6.

Taking 3 flat.