It's sometimes worth checking the dupe sales when raising an item:

They are as follows:

https://backpack.tf/profiles/76561198378431866#!/compare/1621468800/1622505600 - Bulk/Backpack sale

Looks like half of those items went to Merendas too, so that's also bulk

https://marketplace.tf/items/tf2/434;5;u9 https://backpack.tf/item/926144733

$82.99 / $1.81 = 46 keys

https://backpack.tf/profiles/76561198117742205#!/compare/1628467200/1628640000 - Untrace

https://backpack.tf/profiles/76561198104427294#!/compare/1626480000/1626652800

https://backpack.tf/profiles/76561198117742205#!/compare/1626739200/1628121600 - Untrace

https://backpack.tf/profiles/76561198248881736#!/compare/1626307200/1626566400 - Sold for 40 keys

https://backpack.tf/item/517169531 https://marketplace.tf/items/tf2/434;5;u9

$82.99 / $1.81 = 46 keys

All these sales are below the clean sale, so 56 is still fine, however:

https://steamcommunity.com/market/listings/440/Unusual%20Brain%20Bucket?filter=energy

https://gyazo.com/5614b8167f3a8d792d957bd532945eef

There's an unsold for ~46 keys which I'm not too sure if they're duped or clean