https://backpack.tf/profiles/76561198179944875#!/compare/1579219200/1579305600 Sold for 9 keys

https://backpack.tf/profiles/76561198152434713#!/compare/1579392000/1579564800 Sold with 3 keys for a M. Night Tyrantium Helmet (~13.5 keys)

Beanie: 10.5 keys

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Mini for tyrantium:

https://marketplace.tf/items/tf2/30014;5;u61

Jan 11th 25$ / 1.78 = 14

https://backpack.tf/profiles/76561198928421771#!/compare/1578873600/1578960000 Sold for a Smoking Hermes (~9 keys) and 4 keys

Tyrantium: 13 keys

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Mini mini for hermes:

https://marketplace.tf/items/tf2/633;5;u35

Dec 3 14.99$ / 1.7 = 9

Jan 6th 18.89$ / 1.81 = 10.5

Feb 1st 17$ / 1.78 = 9.5

https://imgur.com/a/ExrWTVJ Two sellers at 8, one at 13.

Sales: 9, 10.5, 9.5

A range of 8 to 10.5 should be accurate enough, couldn't find any more sales on it.

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Sales: 14k and 13k

Range of 13 to 14, couldn't find any more sales

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https://backpack.tf/profiles/76561198414201697#!/compare/1580169600/1580256000 Sold for 9 keys

https://backpack.tf/profiles/76561198072669366#!/compare/1580256000/1580342400 Sold for 8 keys

https://backpack.tf/profiles/76561198072669366#!/compare/1580342400/1581465600 Sold for 9 keys

https://backpack.tf/profiles/76561198084219943#!/compare/1581206400/1581292800 Sold for a Smoking Baker Boy (~12.5 keys) and 20 ref.

Beanie: 12 keys

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Mini for baker boy:

https://marketplace.tf/items/tf2/107;5;u35

Dec 13th 19.99$ / 1.67 = 12

Dec 24th 24.99$ / 1.75 = 14.5

Jan 21st 23.99$ / 1.78 = 13.5

https://backpack.tf/profiles/76561198061376237#!/compare/1575676800/1575763200 Sold with 3 keys for a dbd Baron von Haven (~13.5)

Baker boy: 10.5

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Mini mini for baron:

https://marketplace.tf/items/tf2/30136;5;u62

Dec 26th 23.99$ / 1.78 = 13.5

Jan 20th 29.99$ / 1.78 = 17

https://backpack.tf/profiles/76561198240547400#!/compare/1580515200/1582070400 Sold for 10 keys

Sales: 13.5, 17, 10

Setting a range of 10 to 17 keys, should be accurate enough.

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Total sales: 12, 13.5, 14.5, 10.5

Range of 10.5 to 14.5

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Total sales in order: 9, 10.5, 9, 8, 9, 12

12 is an outlier, setting a range of 8 to 10.5.

Sorry for the messy suggestion, any counter-proof or constructive criticism is appreciated.