might try doing this one

mp - https://marketplace.tf/items/tf2/30662;5;u95

1 valid sale

$40 - January 8th 2023

40/2.02 day rate of key

= 19.80 keys

mannco - https://mannco.store/item/440-magnetic-hat-protector-unusual-a-head-full-of-hot-air

1 valid sale

$25 - November 13th 2022

25/1.87 day rate of key

= 13.36 keys

History #1 - https://backpack.tf/item/11220178005

Sale #1 - Untrace bot site sale

https://backpack.tf/profiles/76561198298504614#!/compare/1669161600/1671580800

https://backpack.tf/profiles/76561198390862579#!/compare/1671667200/1672272000

History #2 - https://backpack.tf/item/8647901276

Sale #1 - To scrap tf untrace amount

https://backpack.tf/profiles/76561199403481773#!/compare/1670457600/1670457600

https://backpack.tf/profiles/76561198135388328#!/compare/1670371200/1670457600

Sale #2 - Scrap sold for 14 keys 1 scrap, with 41 ref on the side of the Unusual

https://backpack.tf/profiles/76561198135388328#!/compare/1671235200/1671148800

https://backpack.tf/profiles/76561198268152403#!/compare/1671148800/1671235200

key rate at lets take 68.77 - https://gyazo.com/2619045158166356a232be24ed3dd44c

68.77-41=27.77 ref + 1 scrap = 27.88 ref

taking it as 13 keys 27.88 ref aka 13.40 keys

Sale #3 - Seemingly bulk/gamble

https://backpack.tf/profiles/76561199202000000#!/compare/1671753600/1671840000

https://backpack.tf/profiles/76561198268152403#!/compare/1671840000/1671926400

History #3 - https://backpack.tf/item/6508004891

Sale #1 - qs bot to qs bot

https://backpack.tf/profiles/76561199059698603#!/compare/1673654400/1673740800

https://backpack.tf/profiles/76561198850178158#!/compare/1673654400/1673740800

History #4 - https://backpack.tf/item/6787393070

Sale #1- untrace

https://backpack.tf/profiles/76561198045080808#!/compare/1658361600/1668729600

https://backpack.tf/profiles/76561198316831771#!/compare/1668643200/1668729600

History #5 - https://backpack.tf/item/4449440942

Sale #1 - untrace

https://backpack.tf/profiles/76561198376885782#!/compare/1667260800/1667347200

https://backpack.tf/profiles/76561198275220411#!/compare/1667260800/1667347200

Sale #2 - 9 keys in mix? (7 keys and milk)

https://backpack.tf/profiles/76561198376885782#!/compare/1667692800/1667779200

https://backpack.tf/profiles/76561198025232124#!/compare/1404975600/1668556800

----

Total sales - 9 / 13.36 / 13.4 / 19.8

Classifieds - https://gyazo.com/98ffd424a61e62a9f3646c9e02638d34

Sellers @ 14.4 keys

Buyers @ 10+ keys

Using scrap sale as an extra data point

Excluding 9 keys and 19.8 keys.

Taking 13 keys flat