Taking over this suggestion https://backpack.tf/suggestion/5efdbae577c1cb08c661696a

Copy pasting proof as-is because it isn't my proof:

//

Proof by https://backpack.tf/u/76561199004640414

Hi again...

Sale 1: https://backpack.tf/profiles/76561198864631226#!/compare/1592784000/1592956800

Sold for Burning Flames Defiant Spartan + 6 keys.

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Mini for the Spartan: https://marketplace.tf/items/tf2/340;5;u13

170 USD on Jun 12. Keys were 2 USD, rounding to 85 keys.

115 USD on May 14th. Keys were 1.9 USD, rounding to 60 keys.

150 USD on Apr. 27th. Keys were 1.82 USD, rounding to 82 keys.

129.99 USD on Apr 11th. Keys were 1.7 USD, rounding to 76 keys.

Taking 76 keys on the Spartan. 76 + 6 is 82 keys for this sale.

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Sale 2: https://backpack.tf/profiles/76561198318170190#!/compare/1591833600/1592956800 Frostbite Backbiter's

Mini provided by sURZ except for the first sale, credits to him:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

MINI:

https://backpack.tf/profiles/76561198148511293#!/compare/1591401600/1591488000 89 pure

Sold with Bubbling Party Phantom for duped MG Gutenkutteharen + 3 keys

https://backpack.tf/profiles/76561198986357133#!/compare/1589846400/1590278400

https://backpack.tf/profiles/76561198148511293#!/compare/1590192000/1590278400

Better used for the Guten.

Sold for PE Shellmet + 19 keys

https://backpack.tf/profiles/76561198232041512#!/compare/1589500800/1589673600

https://backpack.tf/profiles/76561198986357133#!/compare/1589587200/1589673600

The Shellmet is outdated, this is just based on classifieds sellers. 45 key sellers

https://gyazo.com/449112a0b4386c338e700ed9b6700722

45 + 19 = 64 keys

Bulk for GE Bonk Boy

https://backpack.tf/profiles/76561198005590158#!/compare/1589155200/1589241600

https://backpack.tf/profiles/76561198232041512#!/compare/1589155200/1588982400

Bulk for Subatomic Captain Space Mann

https://backpack.tf/profiles/76561198140565712#!/compare/1588982400/1589068800

https://backpack.tf/profiles/76561198005590158#!/compare/1588377600/1589068800

Sold for Vivid Crone's Dome (95 keys)

https://backpack.tf/profiles/76561198209640976#!/compare/1590364800/1590451200

https://backpack.tf/profiles/76561198112709115#!/compare/1590364800/1590451200

Taking 64-95 für the billycock. Averaging @ 79.5k, rounding to 80.

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Sale 3: https://backpack.tf/profiles/76561198172573626#!/compare/1588982400/1589068800

https://backpack.tf/profiles/76561198172573626#!/compare/1589068800/1589155200

80 keys

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Sale 4: https://backpack.tf/profiles/76561197994697258#!/compare/1587945600/1588032000 untraced

That's all...

//

Proof by https://backpack.tf/u/76561198085880346

Sale 1 was not for the Spartan and Keys, but rather for a Misty Skull Ze Goggles (the Spartan and Keys were used for that first).

The Goggles are already updated at 85 Keys, so Sale 1 will be 85 Keys.

https://backpack.tf/profiles/76561198118157202#!/compare/1591747200/1591833600 - A double-spelled Noh was added to the Counterfeit in Sale 2

https://cdn.discordapp.com/attachments/706797586836750346/734197718679027732/garbo.PNG - The Noh later sold for 20 Keys

That'll make Sale 2 60 Keys which is too low (the Frostbite Billycock had a post-life spell applied, hence why so much was added).

https://backpack.tf/profiles/76561198209640976#!/compare/1593129600/1593216000 - Better for the Peak

80 to 85 Keys will work here.

//

Going with 80-85 suggested by moderator