Sale 1:

Sold for 3 keys

https://backpack.tf/profiles/76561198850121720#!/compare/1701388800/1701475200

https://backpack.tf/profiles/76561198084024877#!/compare/1700870400/1701475200

https://backpack.tf/item/12813667425

The metal on the buyer's end wasn't involved.

= 3 keys

Sale 2:

Sold with 1.88 ref (~0.05 keys) for 3 keys

https://backpack.tf/profiles/76561199059632349#!/compare/1707177600/1707264000

https://backpack.tf/profiles/76561198158242622#!/compare/1707177600/1707264000

https://backpack.tf/item/11134782491

= 2.95 keys

Sale 3:

Sold for 2 keys + 58 ref (~0.9 keys)

https://backpack.tf/profiles/76561199084784906#!/compare/1700870400/1700956800

https://backpack.tf/profiles/76561198110248446#!/compare/1700870400/1701216000

https://backpack.tf/item/11663440897

= 2.9 keys

Other Sales:

#1

https://backpack.tf/profiles/76561198072603612#!/compare/1703635200/1703808000

https://backpack.tf/profiles/76561199084784906#!/compare/1703721600/1703808000

https://backpack.tf/item/11134782491

Untraceable

https://backpack.tf/item/10949136930 - mannco

Marketplace Sales

https://marketplace.tf/items/tf2/31207;5;u3003

$6.99, Jan 14th and Jan 26th

https://marketplace.tf/items/tf2/5021;6 - Keys were:

$1.68, Jan 14th

$1.70, Jan 26th

6.99/1.68 = ~4.15 keys

6.99/1.7 = ~4.1 keys

Sellers:

https://imgur.com/a/uiQPT2a

https://backpack.tf/item/10756161962 - 3 keys

Sales at:

2.9

2.95

3

4.1 (marketplace)

4.15 (marketplace)

Seller at 3 counters the sales at 4.1 and 4.15. Excluding them.

Taking 2.9-3 keys.