Resuggestion:

https://backpack.tf/suggestion/61d2c03795e2aa4f190a375e#comment-6237c666f5d1d9322e7342f1

Credits to Xergoyf

https://marketplace.tf/items/tf2/30014;5;u58

12/6: https://manic.tf/keyprice/?at=2021-12-06&price=31.99

$31.99 / $1.84 = 17.39 keys [Excluding as was later dumped to bot]

12/21: https://manic.tf/keyprice/?site=marketplace.tf&at=2021-12-21&price=31.99

$31.99 / $1.82 = 17.58 keys

$29.99 / $1.74 = 17.24 keys

Sale 3 and 4 excluding as it was bought and dumped to bot buyer afterwards

Sale 3

https://backpack.tf/profiles/76561199124947178#!/compare/1634083200/1634601600

Sale 4

https://backpack.tf/profiles/76561198131089513#!/compare/1634947200/1635120000

Sale 5 and 6 are just inventory shifting

Sale 5:

https://backpack.tf/profiles/76561198017901187#!/compare/1635292800/1635552000

Sale 6:

https://backpack.tf/profiles/76561198017901187#!/compare/1635552000/1635552000/nearest

Sale 7:

https://backpack.tf/profiles/76561198941329684#!/compare/1633996800/1634169600

Keys got traded away too quickly, untrace

Sale 8:

https://backpack.tf/profiles/76561198139171368#!/compare/1634688000/1634774400

Shifting inventories

Sale 9:

https://backpack.tf/profiles/76561198139171368#!/compare/1640908800/1640736000

Shifting inventories

Sale 10:

https://backpack.tf/profiles/76561198062284983#!/compare/1632096000/1636416000

Untrace

Sale 11:

https://backpack.tf/profiles/76561199193412191#!/compare/1635120000/1635206400

Untrace

Sale 12 and 13 are shifting inventories:

https://backpack.tf/profiles/76561199111354228#!/compare/1635206400/1635292800

https://backpack.tf/profiles/76561198091502579#!/compare/1635292800/1635206400

Mp sale above

Sale 14:

https://backpack.tf/profiles/76561198091502579#!/compare/1635292800/1635206400

Dumped to qs.store

Sale 15 and 16 excluded as was dumped to STN

https://backpack.tf/profiles/76561199183429648#!/compare/1639785600/1640131200

https://backpack.tf/profiles/76561199183429648#!/compare/1640217600/1640304000

Sale 17:

https://backpack.tf/profiles/76561198125907095#!/compare/1645401600/1645488000

~16 in stuff

Sale 18:

https://backpack.tf/profiles/76561199100748551#!/compare/1642636800/1642723200

https://gladiator.tf/listings/61e88ee32004cce69f7a489d

Likely sold for 16

Sale 19:

https://gladiator.tf/listings/620f1cf25f20b97a019bab0f

https://backpack.tf/profiles/76561199004803157#!/compare/1645056000/1645142400

Likely 16

Taking 16 to 18