resuggest: https://backpack.tf/suggestion/5ed02cd8fe8e1c3690517b5d

Sale 1 + 2:

https://marketplace.tf/items/tf2/30836;5;u84;strange

$95 / $1.68 = 56.55 keys

$73.99 / $1.69 = 43.78 keys

https://backpack.tf/item/6288538275

Sale 3:

untrace

https://backpack.tf/profiles/76561198156689043#!/compare/1583971200/1584144000

https://backpack.tf/profiles/76561198802991149#!/compare/1584144000/1584230400

Sale 4:

bulk/using on bonnet

https://backpack.tf/profiles/76561198068505495#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198084367252#!/compare/1587513600/1587600000

Sale 5:

50 keys

https://imgur.com/a/nGG94FO

https://backpack.tf/profiles/76561199001511205#!/compare/1584835200/1587859200

https://backpack.tf/profiles/76561198084367252#!/compare/1587772800/1587859200

Sale 6:

maybe something missing? seems very high

Ghastly Grove Dancing Doe(102)

https://backpack.tf/profiles/76561199001511205#!/compare/1587859200/1587945600

https://backpack.tf/profiles/76561198061779536#!/compare/1587859200/1587945600

Sale 7:

on the edge of bulk - better used on beak

sold with 48 keys for orb fire beak

https://backpack.tf/profiles/76561198061779536#!/compare/1589846400/1589932800

https://backpack.tf/profiles/76561198100836666#!/compare/1589846400/1589932800

=================================================================

Sales:

44,50,57

Shuffle spy:

The person who paid 57 ended up selling it 9 days later for only 37 Keys in Sale 3.

https://cdn.discordapp.com/attachments/527213473785184303/718885016867962931/unknown.png - The Honcho's is Blizzardy

https://cdn.discordapp.com/attachments/527213473785184303/721475814839025714/unknown.png - Proof of the Honcho effect

I'd rule 57 an outlier since it was sold for far less and go 44 - 50 here.