Credits to FIREMAGEPENGUIN and K1ng

Sale 1: ?

https://backpack.tf/profiles/76561198115721685#!/compare/1645228800/1645315200

https://backpack.tf/profiles/76561198048792033#!/compare/1645315200/1645401600

Sale 2: 80 pure

https://backpack.tf/profiles/76561198158206236#!/compare/1646524800/1646784000

https://backpack.tf/profiles/76561198828548568#!/compare/1646611200/1647043200

Sale 3: 57 pure

https://backpack.tf/profiles/76561198133606132#!/compare/1645488000/1645660800

https://backpack.tf/profiles/76561198376885782#!/compare/1645574400/1645660800

https://gladiator.tf/listings/62179fced01648d140092ffe

Sales 4/5: untrace

https://backpack.tf/profiles/76561198115721685#!/compare/1645401600/1645488000

https://backpack.tf/profiles/76561198453530349#!/compare/1645401600/1645488000

https://backpack.tf/profiles/76561198337734785#!/compare/1645401600/1645488000

Sale 6: bulk w/ skinport bot

https://backpack.tf/profiles/76561198376885782#!/compare/1646697600/1646784000

Sale 7: marketplace

https://marketplace.tf/items/tf2/590;5;u34

https://manic.tf/keyprice/?at=2022-02-28&site=marketplace.tf

$150 / $1.75 = 85.71 keys

Sale 8: steaming brainiac 1 for 1

https://backpack.tf/profiles/76561198301049636#!/compare/1646524800/1646611200

https://backpack.tf/profiles/76561198281630040#!/compare/1646524800/1646611200

https://backpack.tf/profiles/76561199101711836#!/compare/1648944000/1649030400

https://gladiator.tf/sales?item=Steaming%20Brainiac%20Hairpiece&at=2022-04-14T11:19:01.394Z

Steaming Brainiac has sold for 80 keys, so taking 80 for this sale

Sale 9: bubbling brainiac + pmoon handy thing = ethereal essence mr. bones

https://backpack.tf/profiles/76561198331167728#!/compare/1644537600/1644624000

https://backpack.tf/profiles/76561198140316312#!/compare/1644537600/1644624000

These were missed from before?:

https://mannco.store/item/440-bubbling-unusual-brainiac-hairpiece

https://manic.tf/keyprice/?site=mannco.store&at=2022-02-19&price=56.27

$56.27 / $1.62 = 34.73 keys

Probably something else was involved here

New sales:

https://marketplace.tf/items/tf2/590;5;u34

https://manic.tf/keyprice/?at=2022-04-11&price=150

$150 / $1.73 = 86.71 keys

$150 / $1.73 = 86.71 keys

https://backpack.tf/item/2654385984

https://backpack.tf/item/771265345

https://backpack.tf/item/1020056333

https://backpack.tf/profiles/76561198376885782#!/compare/1648857600/1648944000

https://backpack.tf/profiles/76561198060333234#!/compare/1648857600/1648944000

73 keys

https://backpack.tf/profiles/76561198060333234#!/compare/1648944000/1649894400

https://backpack.tf/profiles/76561198115721685#!/compare/1649376000/1649462400

Untrace

https://backpack.tf/item/1185937037

https://backpack.tf/profiles/76561198140316312#!/compare/1648857600/1648944000

https://backpack.tf/profiles/76561198115721685#!/compare/1648857600/1648944000

https://gladiator.tf/listings/6248dbe0c73a2edbb201d885

Might be 73 keys, wouldn't be more than 80 given snapshot

https://backpack.tf/item/1677806031

https://backpack.tf/profiles/76561198828548568#!/compare/1647734400/1647820800

https://backpack.tf/profiles/76561198072999396#!/compare/1647734400/1647820800

https://gladiator.tf/listings/62368327e8ccec67d2e5c93e

13 keys match, incomplete, B/O at 75 keys

https://backpack.tf/profiles/76561198072999396#!/compare/1648944000/1649030400

https://backpack.tf/profiles/76561198075045529#!/compare/1648857600/1649030400

Neutron Star Safe'n'Sound + Orbiting Planets Brainiac Hairpiece + Sweets for Bubbling Brainiac Hairpiece + Green Energy L'homme Burglerre + Sweets, pretty bulky, not using

Sales:

35? (incomplete), 57, 73, 73?, 80, 80, 86, 87, 87

Classies: https://gladiator.tf/listings/625d48d48d3249a5201d9926

K1ng: Not an easy decision but 57-87 is probably the safest way to go, as it includes pretty much all sales.

57-87.