Resuggestion, thanks to K1ng for the info!

Sale 1:

https://backpack.tf/profiles/76561198170190173#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561197994697258#!/compare/1567814400/1567900800

Bulk

Sale 2:

https://backpack.tf/profiles/76561198002757046#!/compare/1563667200/1563753600

https://backpack.tf/profiles/76561198342161127#!/compare/1568419200/1568505600

Untrace

Sale 3:

https://backpack.tf/profiles/76561198342161127#!/compare/1569283200/1569369600

https://backpack.tf/profiles/76561198077053437#!/compare/1569369600/1569542400

Sold for 75 keys

Sale 4:

https://backpack.tf/profiles/76561198077053437#!/compare/1569888000/1570579200

https://backpack.tf/profiles/76561198002757046#!/compare/1570492800/1570579200

QS(?)

sale 5:

https://backpack.tf/profiles/76561198002757046#!/compare/1570492800/1570579200

https://backpack.tf/profiles/76561198055343878#!/compare/1570579200/1570665600

Sold for 63 keys

sale 6:

https://backpack.tf/profiles/76561198077555267#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198086948995#!/compare/1565913600/1566000000

Sold with DBD Tyro + 5 keys for Beams Batter + Blizzardy Soldered

Tyro is unupdatable:

https://pastebin.com/PxBxKQZF

sales too discrepant compared to sellers.

https://bot.tf/stats/listings/MVR6887W

B/O of 78 keys

Sale 7:

https://backpack.tf/profiles/76561198086948995#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198448961598#!/compare/1566518400/1566604800

Seems high

Sale 8:

https://backpack.tf/profiles/76561198448961598#!/compare/1566604800/1566864000

https://backpack.tf/profiles/76561198006544512#!/compare/1566777600/1566864000

Sold for Beams Hustler(74)

Sale 9:

https://backpack.tf/profiles/76561197962162999#!/compare/1568246400/1568332800

https://backpack.tf/profiles/76561198303749961#!/compare/1565654400/1568332800

Sold for ~67 keys

Sale 10:

https://marketplace.tf/items/tf2/340;5;u13

https://backpack.tf/item/252076530

indate sale is duped

Total sales @:

63, 67, 74, 75 keys

unsold for 2 months at 75 keys,

buyers up to 56 keys,

K1ng's Part:

63 went in a few hours, so better exclude that.

Taking 67 - 75 keys