Study

Item 1

https://backpack.tf/item/7957028776

Sale 1

https://backpack.tf/profiles/76561198047437575#!/compare/1605225600/1608076800

https://backpack.tf/profiles/76561198967088046#!/compare/1605744000/1605830400

Bought off SCM

Sale 2

https://backpack.tf/profiles/76561198967088046#!/compare/1609372800/1609545600

https://backpack.tf/profiles/76561198024662535#!/compare/1608854400/1609632000

Untrace

Item 2

https://backpack.tf/item/2783428885

Sale 3

https://backpack.tf/profiles/76561198202111664#!/compare/1611100800/1611187200

https://backpack.tf/profiles/76561198204215085#!/compare/1611100800/1611187200

Bulk for Twinkling Lights Taunt: Mannrobics

Sale 4

https://backpack.tf/profiles/76561198204215085#!/compare/1611187200/1611273600

Untrace

https://gladiator.tf/listings/600a1ff53fdefa371e29c099 - buyout 16 keys

https://prnt.sc/10217ka

Added:

Accursed Taunt: Spent Well Spirits

For an Unusual shotgun, untrace

Excluding

Marketplace sales

Nov 23rd - $32.63 / $1.75 = 18.65 keys

Jan 1st - $39.99 / $2.13 = 18.77 keys

Sales

19, 19, 19

Jan 30th - $39.99 / $2.10 = 19.04 keys

Going with 19 flat