Sale 1:

Sold from scrap.tf with negligible metal for 8 keys

https://backpack.tf/profiles/76561198135388328#!/compare/1701475200/1701561600

https://backpack.tf/profiles/76561197993013919#!/compare/1620604800/1702166400

https://backpack.tf/item/13145210239

= 8 keys

Sale 2:

Sold for 7 keys + 25 ref (rounds to 0.5)

https://backpack.tf/profiles/76561199059800460#!/compare/1706140800/1706227200

https://backpack.tf/profiles/76561198059165849#!/compare/1705968000/1706227200

https://backpack.tf/item/9539294681

= ~7.5 keys

Sale 3:

Sold for 7 keys

https://backpack.tf/profiles/76561198167452586#!/compare/1703808000/1703980800

https://backpack.tf/profiles/76561198168578115#!/compare/1703808000/1703894400

https://backpack.tf/item/10314517464

= 7 keys

Sale 4:

Sold for 7 keys

https://backpack.tf/profiles/76561198056531586#!/compare/1705104000/1705190400

https://backpack.tf/profiles/76561198041755135#!/compare/1705104000/1705190400

https://backpack.tf/item/12996125841

= 7 keys

Sale 5:

Sold for 7 keys (Buyer's end)

https://backpack.tf/profiles/76561199072654974#!/compare/1701561600/1701648000

https://backpack.tf/profiles/76561198168578115#!/compare/1701561600/1701734400

https://backpack.tf/item/9539294681

Some metal may have been involved, didn't check. Given the sales we have, it wouldn't alter the range.

= 7 keys

Other Sales:

#1

https://backpack.tf/profiles/76561197997138838#!/compare/1702857600/1702944000

https://backpack.tf/profiles/76561198087195582#!/compare/1703203200/1703289600

https://backpack.tf/item/9539294681

Untraceable. Gambled afterwards.

#2

https://backpack.tf/profiles/76561198842513888#!/compare/1703980800/1704067200

https://backpack.tf/profiles/76561199059632349#!/compare/1704067200/1704153600

https://backpack.tf/item/9539294681

Untraceable

#3

https://backpack.tf/profiles/76561198168578115#!/compare/1704499200/1704672000

https://backpack.tf/profiles/76561199245733895#!/compare/1704412800/1704499200

https://backpack.tf/item/10314517464

Untraceable. Gambled afterwards.

#4

https://backpack.tf/profiles/76561198168578115#!/compare/1700784000/1700870400

https://backpack.tf/profiles/76561198311498888#!/compare/1700784000/1700870400

https://backpack.tf/item/13145210239

Bulk for keys

#5

https://backpack.tf/profiles/76561198311498888#!/compare/1701216000/1701302400

https://backpack.tf/profiles/76561198999316370#!/compare/1701043200/1701302400

https://backpack.tf/item/13145210239

Untraceable

#6

https://backpack.tf/profiles/76561198999316370#!/compare/1701302400/1701734400

https://backpack.tf/profiles/76561198135388328#!/compare/1701475200/1701561600

https://backpack.tf/item/13145210239

Untraceable

#7

https://backpack.tf/profiles/76561198012263719#!/compare/1700352000/1701388800

https://backpack.tf/profiles/76561198453530349#!/compare/1700265600/1700352000

https://backpack.tf/item/13781297796

Untraceable

#8

https://backpack.tf/profiles/76561198453530349#!/compare/1702252800/1702339200

https://backpack.tf/profiles/76561198004478413#!/compare/1702252800/1702339200

https://backpack.tf/item/13781297796

Untraceable

#9

https://backpack.tf/profiles/76561199203680409#!/compare/1700870400/1700956800

https://backpack.tf/profiles/76561198969780960#!/compare/1700870400/1700956800

https://backpack.tf/item/13564915372

Untraceable, 9 keys match.

#10

https://backpack.tf/profiles/76561198168578115#!/compare/1702339200/1702512000

https://backpack.tf/profiles/76561197997138838#!/compare/1702771200/1702857600

https://backpack.tf/item/9539294681

Untraceable.

#11

https://backpack.tf/profiles/76561198148861712#!/compare/1703980800/1704067200

https://backpack.tf/profiles/76561199072654974#!/compare/1703980800/1704067200

https://backpack.tf/item/12609393594

Untraceable. 1 key and some metal match.

#12

https://backpack.tf/profiles/76561198135388328#!/compare/1701302400/1701388800

https://backpack.tf/profiles/76561198042080367#!/compare/1701475200/1702857600 (no better compare link)

https://backpack.tf/item/13826003494

6 keys? Hard to verify. Don't want to use this as a low-end without being sure.

#13

https://backpack.tf/profiles/76561198042080367#!/compare/1701475200/1702857600

https://backpack.tf/profiles/76561198135388328#!/compare/1701648000/1701734400

https://backpack.tf/item/13826003494

Untraceable

https://backpack.tf/item/9700926030 - mannco

https://backpack.tf/item/9853548289 - unusualified

Sellers:

https://imgur.com/a/GZhqsCy

https://backpack.tf/item/9539294681 - 11 keys

https://backpack.tf/item/13826003494 - marketplace

https://backpack.tf/item/12771322068 - marketplace

https://backpack.tf/item/9750057258 - marketplace

https://backpack.tf/item/12609393594 - marketplace

https://backpack.tf/item/9633029005 - marketplace

Sales at:

7 (3x)

7.5

8

Taking 7-8.