https://marketplace.tf/items/tf2/1110;5;u3044

Oct 24 - $24 / $1.86 = 12.90 keys

Oct 30 - $25 / $1.84 = 13.59 keys

Oct 31 - $19.99 / $1.83 = 10.92 keys

Nov 7 - $16 / $1.81 = 8.84 keys

Nov 8 - $22 / $1.81 = 12.15 keys

Nov 27 - $10 / $1.76 = 5.68 keys

Dec 24 - $15.99 / $2.10 = 7.61 keys

https://backpack.tf/item/8247016458

https://backpack.tf/profiles/76561198371048119#!/compare/1607990400/1608940800

https://backpack.tf/profiles/76561197966177118#!/compare/1607990400/1608076800

Untraceable

https://backpack.tf/profiles/76561198841031804#!/compare/1603670400/1603756800

https://backpack.tf/profiles/76561198133920950#!/compare/1571616000/1604793600

Unusualified

https://backpack.tf/profiles/76561198327240059#!/compare/1604620800/1604966400

https://backpack.tf/profiles/76561198019257028#!/compare/1604534400/1604620800

Untraceable

https://backpack.tf/profiles/76561198123146104#!/compare/1604620800/1604707200

https://backpack.tf/profiles/76561198258257749#!/compare/1604707200/1604880000

I don't know

Sales:

6

8

9

11

12

13

14

https://gyazo.com/f9477ee3aa79cc547b2daa6726355664

Buyers to 6

The two oldest sales are 13 and 14

Newest (kinda) sales are 8, 6 (under buyers) and 12

Maybe 8-12?