Resuggestion: https://backpack.tf/suggestion/5f545e3104b5304b2732efca

Marketplace.tf sale

https://marketplace.tf/items/tf2/31034;5;u33

Sale #1: $28.00 / $1.85 (https://manic.tf/keyprice/?at=2020-08-07) = 15.14 ~ 15 keys

https://backpack.tf/item/7549065570

B/O was 13 keys: https://gyazo.com/593c181811e24ce9adf4ee766d5af49d / https://gyazo.com/9d62008ecb626f023329260475d80082

Sale #1 item tracing:

Sale #2

dumped to bot 2 days later, probably at ~6 keys - https://gyazo.com/e5abc7f3375ce6981e6b0f2ab4edacc4

https://backpack.tf/profiles/76561198343842301#!/compare/1596844800/1597276800

https://backpack.tf/profiles/76561198341171690#!/compare/1596758400/1597017600

Sale #3

traced 9 keys

https://backpack.tf/profiles/76561198341171690#!/compare/1597622400/1597708800 (ID: 9124081289)

https://backpack.tf/profiles/76561198865272573#!/compare/1597449600/1597708800

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Current listings: https://gyazo.com/056f4584d8203c8d568dfea9ca11ec7a

Selling for 12 keys

Buying at highest 6.11 keys

1 selling at Mannco.store for $19.95 / ~$.167 = 11.95 keys (https://mannco.store/item/10813)

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Credit K1ng

"If it was bought for 13 and resold for 6, there's no reason to include just one of the sales and exclude the other. Best to ignore both and go with 9 flat."

Taking 9 keys