Sale 1:

Sold for 6 keys

https://backpack.tf/profiles/76561198148983233#!/compare/1701302400/1701388800 - Near ID: 13855563541

https://backpack.tf/profiles/76561198079969248#!/compare/1646352000/1705881600

https://backpack.tf/item/7606374393

= 6 keys

Sale 2:

Sold to a bot for 4 keys + 25.44 ref (~0.4 keys)?

https://backpack.tf/profiles/76561198138760165#!/compare/1706400000/1707350400

https://backpack.tf/profiles/76561199177136435#!/compare/1706313600/1706400000

https://backpack.tf/item/10553084086

The keys went towards the Strange Kunai in the seller's backpack before being scanned. Keys are visible on the buyer's end.

Can't find the metal, but I'll give it the benefit of the doubt. Not like it'll matter to the range anyways.

= 4.4 keys

Other Sales:

#1

https://backpack.tf/profiles/76561198362305972#!/compare/1703376000/1703462400

https://backpack.tf/profiles/76561198093177263#!/compare/1703376000/1703462400

https://backpack.tf/item/6358261894

Untraceable

#2

https://backpack.tf/profiles/76561199189717419#!/compare/1700524800/1700611200

https://backpack.tf/profiles/76561199161916038#!/compare/1700524800/1700611200

https://backpack.tf/item/7606374393

Untraceable. Gambled afterwards.

#3

https://backpack.tf/profiles/76561198262069196#!/compare/1700265600/1708214400

https://backpack.tf/profiles/76561199389427589#!/compare/1708214400/1708214400 (no good compare link)

https://backpack.tf/item/3373198025

Untraceable, potentially scammed

#4

https://backpack.tf/profiles/76561199186541168#!/compare/1701907200/1701993600

https://backpack.tf/profiles/76561198239513168#!/compare/1700265600/1702252800

https://backpack.tf/profiles/76561198239513168#!/compare/1705449600/1706054400

https://backpack.tf/profiles/76561199272632371#!/compare/1701993600/1706140800

https://backpack.tf/item/2884268779

Multiple bot transfers

#5

https://backpack.tf/profiles/76561199085308746#!/compare/1701043200/1701129600

https://backpack.tf/profiles/76561198088383226#!/compare/1700179200/1701216000

https://backpack.tf/item/2706917382

Untraceable

https://backpack.tf/item/8837109827 - unusualified

https://backpack.tf/item/7290122603 - hacked

https://backpack.tf/item/3543397057 - mannco

https://backpack.tf/item/3296825998 - mannco/gambled

https://backpack.tf/item/3055268418 - duped, no sale here

https://backpack.tf/item/2727833659 - mannco

https://backpack.tf/item/5428160819 - marketplace

Sellers:

https://imgur.com/a/ZI2mnF3

https://backpack.tf/item/11936478008 - 9 keys

https://backpack.tf/item/3055268418 - 9 keys

https://backpack.tf/item/3749891859 - 9 keys

https://backpack.tf/item/2884268779 - 9 keys

https://backpack.tf/item/14101332063 - 9 keys

https://marketplace.tf/items/tf2/1120;5;u3006

https://backpack.tf/item/5428160819 - marketplace, currently for $12 (~7 keys)

Sales at:

4.4

6

Buyers up to 5.2 keys, excluding 4.4.

Might seem like a harsh drop considering the sale at 6 occurred in about a day of the seller owning it, however:

The buyer doesn't appear to be re-selling

We have absolutely no sales for higher (not even on marketplace), only one for even less than 6

The only sellers have remained unsold for many months indicating the current price is not very accurate

There's a marketplace listing for a key more than the sale at 6.

Going with 6 keys.