All duped

https://backpack.tf/profiles/76561198125791160#!/compare/1623974400/1624060800

https://backpack.tf/profiles/76561198097232040#!/compare/1623974400/1624060800

Circling Peace Sign Noh Mercy - 215 keys https://backpack.tf/suggestion/60a69f2172d36a71a97f3302

Sunbeams Prehistoric Pullover

Pro KS Aus Medi Gun - ~90 keys at the time https://gladiator.tf/listings/60cd31c25b49418480ef49f2

and 80 keys, buyout of 500 keys https://gladiator.tf/listings/60cda0b26078b282adb1dd6e

https://backpack.tf/profiles/76561198097232040#!/compare/1624665600/1624752000

https://backpack.tf/profiles/76561198285371555#!/compare/1624665600/1624752000

Not bulk, but better used on the Knifestorm Vintage Tyrolean

https://backpack.tf/profiles/76561198285371555#!/compare/1624838400/1624924800

https://backpack.tf/profiles/76561198841365001#!/compare/1624838400/1624924800

Kinda bulk for Chiroptera Killer's Kabuto, added SBTWC Sultan, 10 keys, and taunt for the Kabuto

https://backpack.tf/profiles/76561198114402400#!/compare/1623024000/1623110400

https://backpack.tf/profiles/76561198165629568#!/compare/1623024000/1623110400

Duped Cloud 9 Polar Pullover

https://gladiator.tf/listings/60b9c477f68e242e978d35f9 500 key buyout

The Duped C9 Polar Pullover has one other sale, 500 keys

https://backpack.tf/profiles/76561198083134207#!/compare/1621209600/1621296000

https://backpack.tf/profiles/76561198165629568#!/compare/1621209600/1621296000

https://gladiator.tf/listings/609e95435442948c204f94e3 500 key buyout on the polar

the Ballcap was sold for 55 or 56 https://backpack.tf/profiles/76561198361943704#!/compare/1621209600/1621296000 https://gladiator.tf/listings/60a14bb2fe07821a188d0747

This section looks big, but basically, the sale is 500 keys (Duped C9 Polar, which previously sold for 500)

https://backpack.tf/profiles/76561198165629568#!/compare/1624406400/1624492800

https://backpack.tf/profiles/76561198164651434#!/compare/1624492800/1624579200

Untraceable, moved alongside Sunbeams HKC for something

https://backpack.tf/profiles/76561198128141636#!/compare/1620777600/1620950400

https://backpack.tf/profiles/76561198189534714#!/compare/1620864000/1620950400

Bulk for Burning Team Captain

https://backpack.tf/profiles/76561198189534714#!/compare/1621036800/1621209600

https://backpack.tf/profiles/76561198088878793#!/compare/1621123200/1621209600

Something Burning Flipped Trilby (425 keys) + 20 keys, confirmation is in the Trilby's suggestion

https://backpack.tf/suggestion/60dfd75b77b54755507d21c2

It was already used there, but it's not part of any definitive end of the range, so I will repurpose it here and call this sale 445 keys

https://backpack.tf/profiles/76561198088878793#!/compare/1621123200/1621209600

https://backpack.tf/profiles/76561198088707185#!/compare/1621123200/1621209600

276 keys matches

So much for using that above sale

Sales:

276

445

500

500

Since there's two lower sales, I don't think I want to exclude 445 entirely

Going with 445-500 keys