History 1: https://backpack.tf/item/7988005605

7 keys 20 ref, ~7.5 keys:

https://backpack.tf/profiles/76561198070197196#!/compare/1630627200/1634860800

https://backpack.tf/profiles/76561198081458286#!/compare/1632700800/1632787200

History 2:

MPTF seller at $24.99 (~13 keys) https://marketplace.tf/items/tf2/30876;5;u3041

https://marketplace.tf/items/tf2/30876;5;u3041

$24.99 / $1.87 = 13.36 keys ~13 keys

Unsold at 10 keys for 6 months https://backpack.tf/item/9421724993

13 looks high, it's also Marketplace.tf.

from Xerg:

"New sales (creds Shuffle)

https://backpack.tf/profiles/76561198072725528#!/compare/1635033600/1635292800 - 7 Keys

https://backpack.tf/profiles/76561198349542950#!/compare/1635552000/1635724800 - Buy order was ~7 Keys

https://gladiator.tf/listings/617f5ff4f4cbb8cdf568531a - The buy order

A Strange spec ks amb was added in the 7.5 sale. https://backpack.tf/item/9961924866 That makes the sale 8.5.

7 - 8.5 will work here."