https://marketplace.tf/items/tf2/97;5;u13

Sep 17 - $100 / $1.84 = 54.35 keys

Nov 3 - $99.99 / $1.81 = 55.24 keys

Nov 14 - $61.2 / $1.78 = 34.38 keys

Nov 19 - $96.99 / $1.74 = 55.74 keys

https://backpack.tf/profiles/76561198408816610#!/compare/1599868800/1600646400

https://backpack.tf/profiles/76561198180923509#!/compare/1599868800/1599955200

Some keys match and it looks like they were spent in the same day

https://backpack.tf/profiles/76561198180923509#!/compare/1603238400/1603324800

https://backpack.tf/profiles/76561198002757046#!/compare/1603152000/1603238400

Untraceable

https://backpack.tf/profiles/76561198002757046#!/compare/1603238400/1603324800

https://backpack.tf/profiles/76561198091502579#!/compare/1603238400/1603324800

42 keys, sold in a day of owning

https://backpack.tf/profiles/76561198024332838#!/compare/1600646400/1600732800

https://backpack.tf/profiles/76561198859721638#!/compare/1600560000/1600646400

Bulk

https://backpack.tf/profiles/76561198859721638#!/compare/1600646400/1600732800

https://backpack.tf/profiles/76561199063340462#!/compare/1600646400/1600732800

35 keys and refined

https://backpack.tf/profiles/76561198300150082#!/compare/1604966400/1605312000

https://backpack.tf/profiles/76561198139370347#!/compare/1605225600/1605312000

Untraceable

https://backpack.tf/profiles/76561198139370347#!/compare/1605398400/1605484800

https://backpack.tf/profiles/76561198059874094#!/compare/1605398400/1605484800

45 keys

https://backpack.tf/profiles/76561198059874094#!/compare/1605398400/1605484800

https://backpack.tf/profiles/76561198107517454#!/compare/1605398400/1605484800

45 keys

https://backpack.tf/profiles/76561198107517454#!/compare/1605484800/1605571200

https://backpack.tf/profiles/76561198173442901#!/compare/1605484800/1605571200

Keys in 97 key stack match, likely bought several items at once

https://backpack.tf/profiles/76561198173442901#!/compare/1605571200/1605657600

https://backpack.tf/profiles/76561198337734785#!/compare/1605571200/1605657600

41 keys and 1 scrap

Sales

34

35

41

42

45

45

54

55

56

https://gyazo.com/61dcc435dd65ed9f1d1abc751a3658dd

One seller at 48 keys, young

Buyers up to 41 keys

Going with 45-56 for now

Nov 24 - $97.99 / $1.76 = 55.68 keys

no other sales, seller at 48 still there

just another one of those better-on-marketplace hats :B