With reference to https://backpack.tf/suggestion/5f39c7676f8ff23f997ee999

sale 1:

https://backpack.tf/profiles/76561198107349083#!/compare/1588377600/1589241600

https://backpack.tf/profiles/76561198207728836#!/compare/1592870400/1593820800

Untrace, likely keys

sale 2:

https://backpack.tf/profiles/76561198207728836#!/compare/1593820800/1594684800

https://backpack.tf/profiles/76561198341171690#!/compare/1595635200/1596067200

QS

sale 3:

https://backpack.tf/profiles/76561198803829026#!/compare/1595289600/1596240000

https://backpack.tf/profiles/76561198027752491#!/compare/1594684800/1596240000

Untrace, maybe keys?

sale 4:

https://mannco.store/item/15276

Sold for $36

Keys fluctuated during this time, taking 7 day average:

https://mannco.store/item/1

https://gyazo.com/e21df97db93999b0b4af589837963aed

1.84, 1.8, 1.79, 1.78, 1.93, 1.9, 1.81 / 7 = 1.8357.... OR 1.84

36 / 1.84 = 19.565 keys

https://i.imgur.com/AjADl3y.jpg

https://i.imgur.com/GlSeliO.jpg

https://backpack.tf/item/7957409021

Seller at 12 keys, unsold for almost 2 weeks,

Xergoyf's Comments:

https://backpack.tf/profiles/76561198341171690#!/compare/1597615200/1597701600

https://backpack.tf/profiles/76561198382267048#!/compare/1597536000/1597622400

BooBot sold for 12, only 11 ID match on sellers side, but 12/13 keys on buyers side match

Buyer dumped to mannco.trade the next day.

https://backpack.tf/item/7957440410 - BooBot owned for a bit over a month, I think 20 is probably a high outlier here.

Also for Sale 1, I am getting an ID match for the 16 keys. Near ID: 8786235232

https://backpack.tf/profiles/76561198107349083#!/compare/1588377600/1589241600

12 - 16 should be better here.

Rolling with 12-16 keys.

Credits to Scourge and Xergoyf!

Thanks and Cheers. =)