Credits to EagL and Shuffle Spy.

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Seller: https://backpack.tf/profiles/76561198236099496#!/compare/1585008000/1585094400

Buyer: https://backpack.tf/profiles/76561198011321852#!/compare/1585008000/1585094400

Scorching Flames Dragonborn Helmet + Disco Beat Down Familiar Fez + 2 keys

https://backpack.tf/profiles/76561198011321852#!/compare/1589760000/1589846400 - 91 Keys

https://backpack.tf/profiles/76561198118922746#!/compare/1586131200/1586217600 - Bulk

https://backpack.tf/profiles/76561198283402875#!/compare/1586217600/1586304000 - Item trade that's iffy to use

https://backpack.tf/profiles/76561198283402875#!/compare/1586390400/1586563200 - PE Woodsman

https://backpack.tf/profiles/76561198323733331#!/compare/1588723200/1588809600 - Quicksold for 65 Keys

https://backpack.tf/profiles/76561198280667527#!/compare/1588723200/1588809600 - The Neutron KE first sold for the 65 Keys above

https://backpack.tf/profiles/76561198280667527#!/compare/1588982400/1589068800 - Duped Cloudy Scotch + 4 Keys

https://backpack.tf/profiles/76561198088636158#!/compare/1589500800/1589587200 - Added 8 Keys for a Duped Stormy Pyromancer's

https://imgur.com/a/oFvPBLC - That will make the sale for the Noir capped by its buyout of 90 Keys

https://imgur.com/a/RD7ACID - The person who paid 83 Keys sold it a week and a half later for 62 Keys, where it sold a day later for 67 Keys

~90 keys

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Buyer: https://backpack.tf/profiles/76561198301649793#!/compare/1583625600/1583798400

Pro KS Aussie Knife + Pro KS Aussie Ambassador + 30

for Detective Noir + 2 keys

https://steamuserimages-a.akamaihd.net/ugc/1005938056795814342/B8FBA3B80F4FDF2649EBB9E15ECE7F362DD88B57/

25 + 15 + 30 - 2 = 68

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Seller: https://backpack.tf/profiles/76561198236099496#!/compare/1589587200/1589673600

Buyer: https://backpack.tf/profiles/76561198297884699#!/compare/1589414400/1589673600

1:1 for Sunbeams Deep Cover Operator

https://backpack.tf/suggestion/5efc53835f188d502b15aa72 73

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Seller: https://backpack.tf/profiles/76561198301649793#!/compare/1587945600/1588118400

Buying: https://backpack.tf/profiles/76561198186959465#!/compare/1588032000/1588118400

83 pure

https://steamuserimages-a.akamaihd.net/ugc/1005938056795813730/3A02FE7853C543766BE6CD433A411413844C1CC7/

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Sales:

68

75

83

Shuffle Spy: https://backpack.tf/suggestion/5ecbe76873d55771ac2ff105

The Scorching Dragonborn has sales. They are...

https://backpack.tf/profiles/76561198011321852#!/compare/1589760000/1589846400 - 91 Keys

https://backpack.tf/profiles/76561198118922746#!/compare/1586131200/1586217600 - Bulk

https://backpack.tf/profiles/76561198283402875#!/compare/1586217600/1586304000 - Item trade that's iffy to use

https://backpack.tf/profiles/76561198283402875#!/compare/1586390400/1586563200 - PE Woodsman

https://backpack.tf/profiles/76561198323733331#!/compare/1588723200/1588809600 - Quicksold for 65 Keys

https://backpack.tf/profiles/76561198280667527#!/compare/1588723200/1588809600 - The Neutron KE first sold for the 65 Keys above

https://backpack.tf/profiles/76561198280667527#!/compare/1588982400/1589068800 - Duped Cloudy Scotch + 4 Keys

https://backpack.tf/profiles/76561198088636158#!/compare/1589500800/1589587200 - Added 8 Keys for a Duped Stormy Pyromancer's

https://imgur.com/a/oFvPBLC - That will make the sale for the Noir capped by its buyout of 90 Keys

https://imgur.com/a/RD7ACID - The person who paid 83 Keys sold it a week and a half later for 62 Keys, where it sold a day later for 67 Keys

I would go 75 - 90 Keys (or 73 - 90 if you don't feel like rounding, since the DCO needs a small fix) here, excluding 83 since it was dumped to a quickbuyer.