Resuggestion from https://backpack.tf/suggestion/5f0b9b32123a7e6fdd0bfef4

Copy pasting proof as is because none of it is mine

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Looking at this item: https://backpack.tf/item/1126294780

Sale #1

seller: https://backpack.tf/profiles/76561198208710383#!/compare/1587600000/1590192000

buyer: https://backpack.tf/profiles/76561198141914406#!/compare/1587772800/1587859200

Sold for Massed Flies Charmer's Chapeau = 15-20 keys

Sale #2

seller: https://backpack.tf/profiles/76561198141914406#!/compare/1587859200/1587945600

buyer: https://backpack.tf/profiles/76561198104512843#!/compare/1587600000/1587945600

Looks like 16 keys

Sale #3

seller: https://backpack.tf/profiles/76561198104512843#!/compare/1588809600/1589241600

buyer: https://backpack.tf/profiles/76561198016483606#!/compare/1588550400/1588809600

untrace

Sale #4

seller: https://backpack.tf/profiles/76561198016483606#!/compare/1588809600/1588982400

buyer: https://backpack.tf/profiles/76561198093784657#!/compare/1561766400/1589068800

untrace

Sale #5

seller: https://backpack.tf/profiles/76561198093784657#!/compare/1561766400/1589068800

buyer: https://backpack.tf/profiles/76561198258145748#!/compare/1509494400/1589760000

untrace

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Looking at this item: https://backpack.tf/item/1850818359

Sale #6

seller: https://backpack.tf/profiles/76561198313538268#!/compare/1585785600/1586044800

buyer: https://backpack.tf/profiles/76561198087016902#!/compare/1586044800/1586217600

listings at time of sale: https://bot.tf/stats/listings/M19ZOPN0

Sold for 14 keys

Sale #7

seller: https://backpack.tf/profiles/76561198087016902#!/compare/1586217600/1592179200

buyer: https://backpack.tf/profiles/76561198080179568#!/compare/1589760000/1589846400à

untrace

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Looking at this item: https://backpack.tf/item/7955359339

Sale #7

seller: https://backpack.tf/profiles/76561198986177898#!/compare/1590537600/1590624000

buyer: https://backpack.tf/profiles/76561198296928593#!/compare/1587772800/1591228800

Listings at the time of sale: https://bot.tf/stats/listings/4P0WQ935

also: https://prnt.sc/tgbcys

Sold for 15 keys

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Discarding sale #1 as Massed Flies Charmer's Chapeau is a bit outdated and it's an old sale.

Going with 14-16 keys.

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Proof by https://backpack.tf/u/76561198110369097

I bought one today off Marketplace for $42.00 / $1.94 = 21.6, rounded to 22 keys.

https://marketplace.tf/items/tf2/394;5;u15

Here's the item link, although with the API being down this link might not load for you right now.

https://backpack.tf/item/9022870111

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Proof by https://backpack.tf/u/76561198156255538

Eyewear was updated to 16 here https://backpack.tf/suggestion/5f2530ad29b4ca096931dbcb

16 + 1 = 17

X = 17

https://backpack.tf/profiles/76561198080179568#!/compare/1595203200/1595289600

https://backpack.tf/item/1850818359

Sold for 17 keys here

the mp sale in the comments is gonna be a high outlier, 15 - 17 should be fine here

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Going with 15-17