Using last 2 months.

Sale 1:

Sold for 6 keys

https://backpack.tf/profiles/76561199139085248#!/compare/1705536000/1705622400

https://backpack.tf/profiles/76561198126397190#!/compare/1705622400/1705795200

https://gladiator.tf/sales?item=Screaming%20Tiger%20Taunt:%20Burstchester&at=2024-01-20T01:09:27.441Z - Gladiator confirms

https://backpack.tf/item/4225604759

Not all keys are seen in both compare links. The lucky thing about sales like this, where not many total items are involved is we can manually search IDs.

https://backpack.tf/item/14065104836

https://backpack.tf/item/14065104839

https://backpack.tf/item/14065104841

https://backpack.tf/item/14065104843

https://backpack.tf/item/14065104848

https://backpack.tf/item/14065104851 - 6 keys

= 6 keys

Sale 2:

Sold for 6 keys

https://backpack.tf/profiles/76561199177132803#!/compare/1705968000/1706054400

https://backpack.tf/profiles/76561198061001172#!/compare/1705881600/1706054400

https://gladiator.tf/sales?item=Screaming%20Tiger%20Taunt:%20Burstchester&at=2024-01-25T00:57:43.685Z - Gladiator confirms

https://backpack.tf/item/13784627051

= 6 keys

Sale 3:

Sold for 5 keys + 27 ref?

https://backpack.tf/profiles/76561199370694017#!/compare/1708732800/1708819200

https://backpack.tf/profiles/76561199029736015#!/compare/1708732800/1708819200

https://gladiator.tf/sales?item=Screaming%20Tiger%20Taunt:%20Burstchester&at=2024-02-25T01:09:27.441Z - labelled as 5 keys + 27.55 ref

https://backpack.tf/item/5923591502

We see 27 ref on the seller's end. They most likely cashed their keys out. We have pretty much the right amount of metal here (some people don't tend to bother with scraps here). Going to count this sale.

= 5.45 keys

Other Sales:

#1

https://backpack.tf/profiles/76561199203680409#!/compare/1703721600/1703808000

https://backpack.tf/profiles/76561199044681123#!/compare/1703462400/1703980800

https://backpack.tf/item/9847378200

Untraceable

#2

https://backpack.tf/profiles/76561198257898201 (backpack won't load, no keys in fallback anyways)

https://backpack.tf/profiles/76561199029736015#!/compare/1707955200/1708041600

https://gladiator.tf/sales?item=Screaming%20Tiger%20Taunt:%20Burstchester&at=2024-02-16T01:01:00.882Z - labelled as 5 keys + 0.77 ref

https://backpack.tf/item/13959469189

Untraceable

#3

https://backpack.tf/profiles/76561198084498641#!/compare/1706140800/1706313600

https://backpack.tf/profiles/76561199128560410#!/compare/1706227200/1706313600

https://gladiator.tf/sales?item=Screaming%20Tiger%20Taunt:%20Burstchester&at=2024-01-28T01:01:00.882Z - labelled as 5 keys + 37.22 ref

https://backpack.tf/item/6693463491

Untraceable

#4

https://backpack.tf/profiles/76561198144346135#!/compare/1706140800/1706227200

https://backpack.tf/profiles/76561199193412191#!/compare/1706140800/1706227200d

https://gladiator.tf/sales?item=Screaming%20Tiger%20Taunt:%20Burstchester&at=2024-01-26T01:09:27.441Z - labelled as 5 keys + 37.22 ref

https://backpack.tf/item/4244373383

Untraceable, some metal matches on the seller's end.

#5

https://backpack.tf/profiles/76561198126397190#!/compare/1705795200/1706140800

https://backpack.tf/profiles/76561199107865875#!/compare/1706054400/1706140800

https://gladiator.tf/sales?item=Screaming%20Tiger%20Taunt:%20Burstchester&at=2024-01-25T01:09:27.441Z - labelled as 5 keys + 37.22 ref

https://backpack.tf/item/4225604759

#6

https://backpack.tf/profiles/76561199107865875#!/compare/1707350400/1707436800

https://backpack.tf/profiles/76561199106461781#!/compare/1707350400/1707523200

https://backpack.tf/item/4225604759

Untraceable, doesn't show on gladiator. Gambled afterwards.

Marketplace Sales:

https://marketplace.tf/items/tf2/30621;5;u3006

$15.45, on Dec 30th, Jan 6th & 29th, and Feb 2nd

These sales will end up at around ~8.5 keys, which is way too high compared to sellers. Excluding them.

https://backpack.tf/item/9938762620 - marketplace

https://backpack.tf/item/7902204745 - marketplace

https://backpack.tf/item/4215899809 - hacked on mannco

Sellers:

https://imgur.com/a/qHmyYcz

https://backpack.tf/item/4248555059 - 6 keys

https://backpack.tf/item/4244373383 - 6 keys

https://backpack.tf/item/9712320438 - 6 keys

https://backpack.tf/item/5923591502 - ~6 keys

https://backpack.tf/item/4225604759 - marketplace

https://backpack.tf/item/9938762620 - marketplace

https://backpack.tf/item/6693463491 - marketplace

Sales at:

5.45

6 (2x)

5.45 would round to 5.5. A lot of gladiator sales at ~5.5 keys (#3-#5), it's clear 5.5 is a common trading point, and should be included.

Taking 5.5-6 keys.