https://backpack.tf/profiles/76561198066815050#!/compare/1605398400/1605484800 - This was also in-date when you made this

https://backpack.tf/profiles/76561198066815050#!/compare/1613001600/1613088000 - The Brainiac sold for a Demonflame Wreath + 200

https://backpack.tf/profiles/76561198061533354#!/compare/1609632000/1611792000 - The Wreath sold for a Duped Burning Stash + 200

https://backpack.tf/profiles/76561198969122505#!/compare/1604966400/1605139200 - The Stash sold for 600

https://gyazo.com/4ac977006b9d69607603d22ba1ab63c0 - Proof the Stash got 600 Keys

https://gladiator.tf/listings/6026cc8548eb1566ce56c952 - The Brainiac gets capped at 950

https://backpack.tf/profiles/76561198854233126#!/compare/1612742400/1612828800 - The Pencil sold + a Roboactive Crocleather for a HPJr Belt

https://backpack.tf/profiles/76561198139171368#!/compare/1606608000/1606694400 - Belt sale for ~570

https://backpack.tf/profiles/76561198331167728#!/compare/1608076800/1608163200 - Belt sale for 554

https://backpack.tf/profiles/76561198210864032#!/compare/1611187200/1611273600 - Belt sale for 520

https://backpack.tf/profiles/76561198209640976#!/compare/1612137600/1612224000 - Belt sale for 730

https://backpack.tf/profiles/76561198325595749#!/compare/1611619200/1611705600 - The Gauzed in the 730 sale sold for 300

https://imgur.com/a/d3xpDJX - The Crocleather has no sales, but will end up somewhere between 86 and 125 Keys.

https://gyazo.com/44b856c56e6742e28760ee321903f71b - The Ooze Pencil also sold for a PS Bot Dogger + Searing Beak + 125 Keys

https://gyazo.com/4b6ba477792e550c815ed47ec49a81d0 The 2 hats got immediately dumped for 370 Keys

730 looks to be an outlier, so 545 will work for the Belt. That puts the Ooze Pencil at ~440 - 500.

To account for the Crocleather not actually having any sales, the Spellbound Pencil sale can be rounded to 1900.

1900 - 2500 would work here.