https://marketplace.tf/items/tf2/30767;5;u8

Sep 29 - $20.06 / $1.84 = 10.90 keys

Oct 10 - $27.9 / $1.88 = 14.84 keys

Oct 12 - $27.9 / $1.88 = 14.84 keys

Oct 30 - $27.9 / $1.82 = 15.33 keys

Nov 15 - $27.9 / $1.76 = 15.85 keys

https://backpack.tf/item/7873811196

https://backpack.tf/profiles/76561198080179568#!/compare/1600128000/1600214400

https://backpack.tf/profiles/76561198084813853#!/compare/1600041600/1600300800

12 keys

https://backpack.tf/profiles/76561198084813853#!/compare/1600300800/1600992000

https://backpack.tf/profiles/76561198970665668#!/compare/1600041600/1600300800

Untraceable

https://backpack.tf/profiles/76561198970665668#!/compare/1600300800/1600732800

https://backpack.tf/profiles/76561198804445167#!/compare/1599609600/1600387200

Untraceable

https://backpack.tf/profiles/76561198804445167#!/compare/1600387200/1600560000

https://backpack.tf/profiles/76561198864760524#!/compare/1600300800/1600387200

Untraceable

https://backpack.tf/profiles/76561198864760524#!/compare/1600473600/1600560000

https://backpack.tf/profiles/76561198155441223#!/compare/1600387200/1600560000

Untraceable

https://backpack.tf/profiles/76561198155441223#!/compare/1600560000/1600646400

https://backpack.tf/profiles/76561198850274253#!/compare/1600560000/1600646400

Untraceable

https://backpack.tf/profiles/76561198850274253#!/compare/1600905600/1600992000

https://backpack.tf/profiles/76561199061078997#!/compare/1600905600/1600992000

Untraceable

https://backpack.tf/profiles/76561199061078997#!/compare/1601942400/1602201600

https://backpack.tf/profiles/76561198871414256#!/compare/1559606400/1603756800

like 29 keys of taunts and stuff

No buyout found

https://backpack.tf/profiles/76561198215902495#!/compare/1606262400/1606953600

https://backpack.tf/profiles/76561198018177887#!/compare/1607385600/1607472000

Untraceable

https://backpack.tf/profiles/76561198018177887#!/compare/1607558400/1607644800

https://backpack.tf/profiles/76561199098694108#!/compare/1607644800/1607731200

11 keys and 7 refined

https://backpack.tf/profiles/76561198150464611#!/compare/1600128000/1600300800

https://backpack.tf/profiles/76561198324276106#!/compare/1600214400/1600300800

Using on the Blizz Industrial Festivizer

https://backpack.tf/profiles/76561198150464611#!/compare/1600473600/1601424000

https://backpack.tf/profiles/76561198087746342#!/compare/1601164800/1601251200

12 keys

https://backpack.tf/profiles/76561198087746342#!/compare/1601424000/1601856000

https://backpack.tf/profiles/76561198882579129#!/compare/1601424000/1603238400

13 keys

https://backpack.tf/profiles/76561198285010503#!/compare/1600992000/1601769600

https://backpack.tf/profiles/76561198195933333#!/compare/1600905600/1600992000

Untraceable

https://backpack.tf/profiles/76561198195933333#!/compare/1600992000/1601078400

https://backpack.tf/profiles/76561198080179568#!/compare/1600992000/1601078400

Untraceable

https://backpack.tf/profiles/76561198080179568#!/compare/1603497600/1603584000

https://backpack.tf/profiles/76561198171657449#!/compare/1603497600/1604361600

13 keys

Sales:

11

11

12

12

13

13

15

15

15

15

16

https://gyazo.com/affd6da03604afb9cb3b5dc00be5e7fa

Single buyer at 11

Three sellers at 13

it's hard to ignore so many 15 sales but 11-13 still is half of the data points

going with 11-13