https://marketplace.tf/items/tf2/30800;5;u110

$57.90 / $1.89 = 30.63 keys

$57.90 / $1.87 = 30.96 keys

$49.99 / $1.82 = 27.47 keys

$49.99 / $1.81 = 27.62 keys

$49.99 / $1.81 = 27.62 keys

$59.99 / $1.81 = 33.14 keys

https://backpack.tf/item/5231669550

https://backpack.tf/item/5227112677

https://mannco.store/item/440-starstorm-slumber-unusual-cranial-carcharodon

https://backpack.tf/item/5245230962

$44.21 / $1.68 = 26.32 keys

https://gladiator.tf/sales?item=Starstorm%20Slumber%20Cranial%20Carcharodon&at=2021-09-08T01:02:17.802Z

Somewhere, a buy at ~24 keys

https://backpack.tf/profiles/76561198268944083#!/compare/1600473600/1628294400

https://backpack.tf/profiles/76561199175513659#!/compare/1628208000/1628294400

Untraceable

https://backpack.tf/profiles/76561199175513659#!/compare/1628294400/1628380800

https://backpack.tf/profiles/76561198119805894#!/compare/1628294400/1628380800

~18.5 keys

https://backpack.tf/profiles/76561198261265788#!/compare/1629417600/1629763200

https://backpack.tf/profiles/76561198981913112#!/compare/1629676800/1631059200

https://backpack.tf/profiles/76561198295506987#!/compare/1629417600/1629676800

Bought for 27 keys and then gifted

1st compare is the seller, the 27 keys come from the user in the 2nd compare

2nd compare is the buyer

3rd compare is the gift receiver, you can see the user in the gift tag

https://backpack.tf/profiles/76561198154419887#!/compare/1627171200/1628467200

https://backpack.tf/profiles/76561198057157299#!/compare/1627689600/1627776000

25 keys

https://backpack.tf/profiles/76561198337734785#!/compare/1623715200/1623801600

https://backpack.tf/profiles/76561199088230670#!/compare/1623715200/1623801600

3 refined matches

https://backpack.tf/profiles/76561199088230670#!/compare/1624579200/1624665600

https://backpack.tf/profiles/76561198999577112#!/compare/1624320000/1624579200

Untraceable

https://backpack.tf/profiles/76561198999577112#!/compare/1624665600/1626825600

https://backpack.tf/profiles/76561199101711836#!/compare/1624579200/1624665600

Untraceable

https://backpack.tf/profiles/76561199101711836#!/compare/1624924800/1625011200

https://backpack.tf/profiles/76561198881606210#!/compare/1624752000/1625097600

Untraceable

https://backpack.tf/profiles/76561199085116273#!/compare/1625184000/1625270400 seller #1

https://backpack.tf/profiles/76561199084784906#!/compare/1625270400/1625356800 seller #2

https://backpack.tf/profiles/76561198064658655#!/compare/1625184000/1625270400 buyer

https://gyazo.com/0cb820eb8e3e7dc53aa3e366016fb98f

I bought 2 for ~26 keys each

https://backpack.tf/profiles/76561199100906514#!/compare/1627948800/1628035200

https://backpack.tf/profiles/76561198280524116#!/compare/1627948800/1628035200

30 keys

https://backpack.tf/profiles/76561198188093413#!/compare/1626825600/1626912000

https://backpack.tf/profiles/76561198079136754#!/compare/1615161600/1628121600

Untraceable

https://backpack.tf/profiles/76561198079136754#!/compare/1628380800/1629504000

https://backpack.tf/profiles/76561198841279602#!/compare/1628294400/1628380800

Untraceable

Sales:

18.5

24

25

25

26

26

26

26

27

27

28

28

30

31

31

33

https://gyazo.com/69f4c3d3e5c646670cfafd826fd404d4

Buyers to 25

1 week at 27

2 weeks at 28

https://backpack.tf/item/5226318419 1 month at 32

Going with 25-28, 25-27 also possible