Sale 1:

Sold with 33.44 ref (~0.55 keys) for 3 keys

https://backpack.tf/profiles/76561198890990852#!/compare/1723075200/1723161600

https://backpack.tf/profiles/76561198120195778#!/compare/1723161600/1723420800

https://backpack.tf/item/3562789220

= 2.45 keys

Sale 2:

Sold for 2 keys + 8 ref (~2.15 keys)

https://backpack.tf/profiles/76561199235396148#!/compare/1724803200/1724889600

https://backpack.tf/profiles/76561198804904538#!/compare/1724803200/1724889600

https://backpack.tf/item/3295727623

= 2.15 keys

Sale 3:

Sold to a bot for 2 keys + 2.33 ref

https://backpack.tf/profiles/76561198019285205#!/compare/1708041600/1723680000

https://backpack.tf/profiles/76561199192607141#!/compare/1723593600/1723680000

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Spent%20Well%20Spirits - confirmed

https://backpack.tf/item/3414179650

= 2.05 keys

Other Sales:

#1

https://backpack.tf/profiles/76561198278534665#!/compare/1725580800/1725840000

https://backpack.tf/profiles/76561198799406781#!/compare/1726099200/1727049600

https://backpack.tf/item/13217218823

Untraceable

#2

https://backpack.tf/profiles/76561198799406781#!/compare/1727049600/1729900800

https://backpack.tf/profiles/76561199026390261#!/compare/1727308800/1727395200

https://backpack.tf/item/13217218823

Untraceable

#3

https://backpack.tf/profiles/76561199026390261#!/compare/1728950400/1729036800 - Near ID: 15021164888

https://backpack.tf/profiles/76561198986479706#!/compare/1728432000/1729036800

https://backpack.tf/item/13217218823

Untraceable, 2 keys match

#4

https://backpack.tf/profiles/76561199475128445#!/compare/1729036800/1729123200

https://backpack.tf/profiles/76561199389549498#!/compare/1729123200/1729209600

https://backpack.tf/item/5372388084

Untraceable/bulk. Probably just a transfer.

#5

https://backpack.tf/profiles/76561199392762513#!/compare/1716508800/1727308800

https://backpack.tf/profiles/76561198883878208#!/compare/1726790400/1729036800

https://backpack.tf/item/3988543234

Untraceable

#6

https://backpack.tf/profiles/76561198307230510#!/compare/1729641600/1729728000

https://backpack.tf/profiles/76561198154777866#!/compare/1729641600/1729728000

https://backpack.tf/item/3846024035

Untraceable

#7

https://backpack.tf/profiles/76561198327503564#!/compare/1723248000/1723334400

https://backpack.tf/profiles/76561199026390261#!/compare/1723248000/1723334400

https://backpack.tf/item/3768612545

Bulk

#8

https://backpack.tf/profiles/76561199026390261#!/compare/1726012800/1726099200

https://backpack.tf/profiles/76561198830392400#!/compare/1724976000/1727049600

https://backpack.tf/item/3768612545

Untraceable

#9

https://backpack.tf/profiles/76561198804904538#!/compare/1728777600/1729123200

https://backpack.tf/profiles/76561199652290612#!/compare/1729036800/1729123200

https://backpack.tf/item/3295727623

Untraceable

#10

https://backpack.tf/profiles/76561199652290612#!/compare/1729036800/1729123200

https://backpack.tf/profiles/76561199581722058#!/compare/1729036800/1729123200

https://backpack.tf/item/3295727623

Untraceable

https://backpack.tf/item/5167785177 - marketplace

https://backpack.tf/item/3507238815 - marketplace

https://backpack.tf/item/2954433499 - marketplace

https://backpack.tf/item/3990048836 - mannco

https://marketplace.tf/items/tf2/1114;5;u3003

All marketplace sales exceed current sellers, excluding them.

Sellers:

https://i.imgur.com/i5VYLVj.png

https://backpack.tf/item/4375186055 - ~2.2 keys

https://backpack.tf/item/5372388084 - ~2.25 keys

https://backpack.tf/item/3846024035 - ~2.25 keys

https://backpack.tf/item/13217218823 - ~2.35 keys

https://backpack.tf/item/12685645101 - ~2.45 keys

https://stntrading.eu/item/tf2/Unusual+Holy+Grail+Taunt%3A+Spent+Well+Spirits

https://i.imgur.com/RSspJHc.png

https://backpack.tf/item/3295727623 - ~2.2 leys

Sales at:

2.05

2.15

2.45

Bots buying for more than 2.05 keys, excluding 2.05.

Sellers at ~2.25 keys, excluding 2.45.

Taking 2.15 flat.