DBDBD!

Made suggestion, because someone offered me this hat as 35+

Current value is not valid, many sellers at 30-33 keys. 35 unsold in a month.

https://ibb.co/byMePk <- screenshot

Sales:

MP sale for 44.99 / 2.01 = 22,4

X1 = 22

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25 pure, B\O here

http://www.tf2outpost.com/search/271239024

~22 keys shown here, may be some of them are missing (See my another sugestion, 3 keys are not shown in comparison https://backpack.tf/suggestion/5975ca6fcf6c750e3a29476b)

https://backpack.tf/profiles/76561198165055074#!/compare/1500508800/1500595200

X2 = 25

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Sold for... something

https://backpack.tf/profiles/76561198165055074#!/compare/1500508800/1500854400

https://backpack.tf/profiles/76561198111271528#!/compare/1500163200/1500595200

61 keys total in 3 unus, but at least 7 keys were obtained from same user.

I have no idea about this bargain.

X3 = 0

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Sold for only ~12-13 keys, obviosly Bill with nice spells was counted as ~10 keys.

https://backpack.tf/profiles/76561198151293452#!/compare/1500336000/1500681600

https://backpack.tf/profiles/76561198164831598#!/compare/1500508800/1500681600

X4 = 0

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Sold for DBD Spartan

https://backpack.tf/profiles/76561198089230979#!/compare/1494201600/1494374400

In-date, ~31, but unsold for 28 in 2 weeks, so rounded to 30, with the support of the sell orders.

X4 = 30

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Burning Janissary (duped)

https://backpack.tf/profiles/76561198089230979#!/compare/1495584000/1497484800

In-date, 38. Being sold for 36 (duped)

X4 = 36

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Weeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeell.

36 countered by the current proposals.

22 - by the buy orders at 20-21.

Let's assume that sale for 25 is valid, because B\O capped here.