Sale 1-5:

https://marketplace.tf/items/tf2/30570;5;u3024

$34.5 / $1.77 = 19.49 keys

$35 / $1.75 = 20.00 keys

$31 / $1.77 = 17.51 keys

$47 / $1.72 = 27.33 keys

$52 / $1.68 = 30.95 keys

https://backpack.tf/item/7953521950

Sale 6:

23 keys + 28 ref

https://backpack.tf/profiles/76561198125791160#!/compare/1580515200/1580601600

https://backpack.tf/profiles/76561198072853758#!/compare/1580601600/1580688000

Sale 7:

untrace

https://backpack.tf/profiles/76561198855485521#!/compare/1579392000/1579564800

https://backpack.tf/profiles/76561198305676157#!/compare/1579478400/1579564800

Sale 8:

untrace

https://backpack.tf/profiles/76561198974289370#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198112779962#!/compare/1583539200/1583798400

Sale 9:

dead pres sensei(17)

https://backpack.tf/profiles/76561198054448372#!/compare/1583712000/1583798400

https://backpack.tf/profiles/76561198055672922#!/compare/1583712000/1583798400

https://backpack.tf/suggestion/5e9332db4b2a71485620c086

Sale 10:

bulk

https://backpack.tf/profiles/76561198084367252#!/compare/1586390400/1586476800

https://backpack.tf/profiles/76561198819747735#!/compare/1586390400/1586476800

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

Sales:

17,18,19,20,24,27,31

buyorders have recently been at 17 so excluding: https://imgur.com/a/RLZ9SrT

27+31 high outliers