Using last 2 months.

Sale 1:

Sold to a bot for 2 keys + 3.22 ref (~0.05 keys)

https://backpack.tf/profiles/76561198312403898#!/compare/1705276800/1705363200

https://backpack.tf/profiles/76561198890990852#!/compare/1705276800/1705363200

https://backpack.tf/item/11103780548

= 2.05 keys

Sale 2:

Sold for 2 keys + some scrap

https://backpack.tf/profiles/76561198439498211#!/compare/1705536000/1705622400

https://backpack.tf/profiles/76561199547393408#!/compare/1705536000/1705622400

https://backpack.tf/item/7270962500

= 2 keys

Sale 3:

Sold to a bot for 1 key + 48.33 ref (~0.75 keys)

https://backpack.tf/profiles/76561198319114954#!/compare/1705968000/1706054400

https://backpack.tf/profiles/76561199111292616#!/compare/1705968000/1706054400

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Most%20Wanted&at=2024-01-25T08:47:23.000Z - gladiator confirms

https://backpack.tf/item/10471648294

= 1.75 keys

Sale 4:

Sold to a bot for 1 key + 46 ref (~0.7 keys)

https://backpack.tf/profiles/76561198999384275#!/compare/1703462400/1703980800 - Near ID: 13987482639

https://backpack.tf/profiles/76561199132184792#!/compare/1703894400/1703980800

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Most%20Wanted&at=2023-12-31T09:37:38.840Z - gladiator confirms

https://backpack.tf/item/6389108917

= 1.7 keys

Other Sales:

#1

https://backpack.tf/profiles/76561198850178158#!/compare/1705190400/1705276800

https://backpack.tf/profiles/76561198312403898#!/compare/1630713600/1705276800

https://backpack.tf/item/11103780548

Bulk

#2

https://backpack.tf/profiles/76561199125348079#!/compare/1704067200/1704153600

https://backpack.tf/profiles/76561199059698603#!/compare/1704067200/1704153600

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Most%20Wanted&at=2024-01-02T08:43:06.630Z - labelled as 2 keys + 17.22 ref (~0.25 keys)

https://backpack.tf/item/10471648294

Untraceable

#3

https://backpack.tf/profiles/76561199059632349#!/compare/1705017600/1705104000

https://backpack.tf/profiles/76561199091010215#!/compare/1705017600/1705104000

https://backpack.tf/item/10471648294

Untraceable

#4

https://backpack.tf/profiles/76561199091010215#!/compare/1705104000/1705190400

https://backpack.tf/profiles/76561198319114954#!/compare/1704585600/1705104000

https://backpack.tf/item/10471648294

Bulk for Nebula Universal Translator

#5

https://backpack.tf/profiles/76561198168578115#!/compare/1704931200/1705017600

https://backpack.tf/profiles/76561199111292616#!/compare/1704931200/1705017600

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Most%20Wanted&at=2024-01-12T08:47:23.000Z - labelled as 1 key + 61.55 ref (~0.95 keys)

https://backpack.tf/item/10241424223

Untraceable. Gambled prior.

#6

https://backpack.tf/profiles/76561198336450618#!/compare/1705104000/1706745600

https://backpack.tf/profiles/76561199120802649#!/compare/1705104000/1705190400

https://backpack.tf/item/7270962500

Untraceable

#7

https://backpack.tf/profiles/76561199120802649#!/compare/1705104000/1705190400

https://backpack.tf/profiles/76561199431867051#!/compare/1705104000/1705190400

https://backpack.tf/item/7270962500

Untraceable. Involves the DBD Counterfiet Billycock

#8

https://backpack.tf/profiles/76561199431867051#!/compare/1705104000/1705190400

https://backpack.tf/profiles/76561198120672630#!/compare/1705104000/1705190400

https://backpack.tf/item/7270962500

Bulk/Untraceable

#9

https://backpack.tf/profiles/76561198120672630#!/compare/1705449600/1705536000

https://backpack.tf/profiles/76561198345012090#!/compare/1704931200/1705622400

https://backpack.tf/item/7270962500

Untraceable, involves the aussie black box

#10

https://backpack.tf/profiles/76561198345012090#!/compare/1704931200/1705622400

https://backpack.tf/profiles/76561198439498211#!/compare/1705536000/1705622400

https://backpack.tf/item/7270962500

Untraceable, involves the '72 Rancho

#11

https://backpack.tf/profiles/76561198216241727#!/compare/1701993600/1702080000

https://backpack.tf/profiles/76561198311498888#!/compare/1701993600/1702080000

https://backpack.tf/item/6597044727

Untraceable

#12

https://backpack.tf/profiles/76561198027544408#!/compare/1702857600/1702944000

https://backpack.tf/profiles/76561198890990852#!/compare/1702857600/1702944000

https://backpack.tf/item/4474038513

Untraceable

#13

https://backpack.tf/profiles/76561199112522018#!/compare/1702857600/1702944000

https://backpack.tf/profiles/76561198302026137#!/compare/1703980800/1704844800

https://backpack.tf/item/3963296264

Bulk/Untraceable

#14

https://backpack.tf/profiles/76561198850121720#!/compare/1704758400/1704844800

https://backpack.tf/profiles/76561198135388328#!/compare/1704758400/1704844800

https://backpack.tf/item/3857560103

Untraceable. Dumped too fast to find the buyer/seller.

#15

https://backpack.tf/profiles/76561198135388328#!/compare/1704931200/1705017600

https://backpack.tf/profiles/76561199112522018#!/compare/1704931200/1705017600

https://backpack.tf/item/3857560103

Same story as #14

#16

https://backpack.tf/profiles/76561198124334271#!/compare/1703894400/1704412800

https://backpack.tf/profiles/76561198182419301#!/compare/1702944000/1706486400

https://backpack.tf/item/3605625570

Backpack buy or something

#17

https://backpack.tf/profiles/76561199132184792#!/compare/1705708800/1705795200

https://gladiator.tf/sales?item=Holy%20Grail%20Taunt:%20Most%20Wanted&at=2024-01-22T09:37:38.840Z - labelled as 1 key + 45.33 ref

https://backpack.tf/item/11934240514 - seller doesn't appear

Untraceable

#18

https://backpack.tf/profiles/76561199059698603#!/compare/1704153600/1704240000

https://backpack.tf/profiles/76561198151373000#!/compare/1704153600/1704240000

https://backpack.tf/item/5135770802

Untraceable

https://backpack.tf/item/7760955680 - gambled

https://backpack.tf/item/7540706791 - gambled or otherwise untraceable

https://backpack.tf/item/4639998893 - gambled

Sellers:

https://imgur.com/a/wt8HJBE

https://backpack.tf/item/7760955680 - 2 keys

https://backpack.tf/item/7442895410 - ~2.2 keys

https://backpack.tf/item/4474038513 - ~2.3 keys

https://backpack.tf/item/10371925038 - ~2.3 keys

https://backpack.tf/item/3857560103 - ~2.3 keys

https://backpack.tf/item/7270962500 - ~2.3 keys

https://backpack.tf/item/5580474843 - 3 keys

https://backpack.tf/item/5128563602 - marketplace

https://backpack.tf/item/11934240514 - marketplace

https://backpack.tf/item/4061406664 - marketplace

https://backpack.tf/item/6389108917 - marketplace

https://backpack.tf/item/5135770802 - marketplace

Sales at:

1.7

1.75

2

2.05

A couple buyers currently for any effect at ~1.7 keys, excluding 1.7. Next highest point is 1.75, so wouldn't really matter too much either way.

Taking 1.75-2.05 keys