https://marketplace.tf/items/tf2/31186;5;u177

Sep 6 - $69.99 / $1.81 = 38.67 keys

Sep 12 - $69.99 / $1.84 = 38.04 keys

https://backpack.tf/item/10356494944

https://backpack.tf/profiles/76561198065241300#!/compare/1635465600/1635724800

https://backpack.tf/profiles/76561197982127154#!/compare/1635379200/1635465600

Bulk

https://backpack.tf/profiles/76561197982127154#!/compare/1636761600/1636848000

https://backpack.tf/profiles/76561198993631639#!/compare/1636848000/1636934400

Added Spellbound Didgeridrongo for Australium Wrench

https://backpack.tf/profiles/76561198045883624#!/compare/1630800000/1630886400

https://backpack.tf/profiles/76561198061128112#!/compare/1630800000/1632700800

Untraceable

https://backpack.tf/profiles/76561198263836417#!/compare/1634169600/1634256000

https://backpack.tf/profiles/76561198074925664#!/compare/1633564800/1634601600

Untraceable, buyout of 27 keys https://gladiator.tf/listings/6167d0f7b45180f8b0358d82

https://backpack.tf/profiles/76561198956272094#!/compare/1630454400/1630540800

https://backpack.tf/profiles/76561199125443371#!/compare/1630454400/1630540800

44 item stack, which is ~28 keys

https://backpack.tf/profiles/76561199125443371#!/compare/1630627200/1630713600

https://backpack.tf/profiles/76561198041437691#!/compare/1630627200/1630713600

Untraceable, buyout of 34 keys https://gladiator.tf/listings/61333859d34eef437a83a8eb

https://backpack.tf/profiles/76561198041437691#!/compare/1632960000/1633219200

https://backpack.tf/profiles/76561198117728433#!/compare/1633305600/1633478400

Went through an auction, its the keys leaving the 2nd compare, totaling to 24

https://backpack.tf/profiles/76561198028115480#!/compare/1635379200/1635465600

https://backpack.tf/profiles/76561198301294363#!/compare/1635292800/1635379200

Stormy Storm Toy Soldier, better used there

https://backpack.tf/profiles/76561198301294363#!/compare/1637280000/1637366400

https://backpack.tf/profiles/76561198394257711#!/compare/1637280000/1637366400

Smoking Milkman and 14 keys

https://backpack.tf/profiles/76561198263836417#!/compare/1634083200/1634169600

https://backpack.tf/profiles/76561198138707400#!/compare/1634083200/1634169600

27 keys, histories on keys match

https://backpack.tf/profiles/76561198263836417#!/compare/1632268800/1632355200

https://backpack.tf/profiles/76561198064658655#!/compare/1632268800/1632355200

bulk but apparently i wrote it down as 27 keys

27 keys was also the buyout https://gladiator.tf/listings/614c6bb9ecfe695957859cc7

https://backpack.tf/profiles/76561199100906514#!/compare/1637020800/1637107200

https://backpack.tf/profiles/76561198130164115#!/compare/1637020800/1637107200

30 keys, near ID match

https://backpack.tf/profiles/76561198320968282#!/compare/1632614400/1633219200

https://backpack.tf/profiles/76561199102430997#!/compare/1633132800/1633219200

Untraceable, likely sold to buy order

https://backpack.tf/profiles/76561199102430997#!/compare/1633305600/1633392000

https://backpack.tf/profiles/76561198091502579#!/compare/1633305600/1633392000

2 keys matches, buyout was ~32 keys https://gladiator.tf/listings/615b14d9bdafaabb0257e91a

Sales:

24

28

27

27

30

32

34?

38

39

38 and 39 are from early september and are way too old now to be considered

34 unknown and it might've sold to buy order price in an auction later (24 keys)

Going with 28-32