History 1: https://backpack.tf/item/8221592582

Sold to a bot in bulk:

https://backpack.tf/profiles/76561198092200221#!/compare/1610064000/1610582400

https://backpack.tf/profiles/76561199101484822#!/compare/1610496000/1610582400

Transfers (the human owns both bots)

Sold for 5 keys:

https://backpack.tf/profiles/76561199119392127#!/compare/1616112000/1616198400

https://backpack.tf/profiles/76561198113093440#!/compare/1616112000/1616198400

History 2: https://backpack.tf/item/8172311116

Sold for 5 keys:

https://backpack.tf/profiles/76561199102199351#!/compare/1613001600/1613088000

https://backpack.tf/profiles/76561198887643345#!/compare/1613088000/1613174400

History 3: https://backpack.tf/item/7589027147

Sold to a bot:

https://backpack.tf/profiles/76561198046181402#!/compare/1607731200/1613001600

https://backpack.tf/profiles/76561199004803157#!/compare/1612915200/1613001600

History 4: https://backpack.tf/item/6646629482

Untraceable:

https://backpack.tf/profiles/76561198412759781#!/compare/1608854400/1608940800

https://backpack.tf/profiles/76561198112262407#!/compare/1608768000/1608854400

Sold for 4 keys:

https://backpack.tf/profiles/76561198112262407#!/compare/1608854400/1608940800

https://backpack.tf/profiles/76561198120536691#!/compare/1608768000/1609200000

History 5: https://backpack.tf/item/6469751649

26 ref matches:

https://backpack.tf/profiles/76561198841279602#!/compare/1611964800/1612051200

https://backpack.tf/profiles/76561198945892301#!/compare/1611705600/1612051200

Gladiator.tf stats: https://imgur.com/aO2wMoP

Sale at 5 keys (most likely one of the ones above), bought at 3.89 keys, ~3.9

Marketplace.tf sales: https://marketplace.tf/items/tf2/30761;5;u3026

December 29: $12.99/2.15=6.04 ~6 keys

February 15: $19.99/2.12=9.43 ~9.5 keys

March 4: $14.99/2.18=6.88 ~7 keys

UNSOLDS:

5 keys for nearly a month https://backpack.tf/item/7589027147 https://gladiator.tf/listings/60395d9407947f2c54141a53

10 keys for 4 months: https://backpack.tf/item/5116323694

~6.85 keys https://marketplace.tf/items/tf2/30761;5;u3026

Sales at 3.9, 4, 5, 5, 6, 7, 9.5

Given the seller at 5 has been there for a while and every single higher sale is from Marketplace.tf whitelist, 6-9.5 looks high here.

The sale at 3.9 was to a buy order and is so close to 4 anyway.

Gonna go 4-5 here, 4-5 looks neater than 3.9-5.