Re-suggestion, thanks to K1NG for the info!

Sale 1:

https://backpack.tf/profiles/76561198182795337#!/compare/1524355200/1524441600

https://backpack.tf/profiles/76561198211034693#!/compare/1524268800/1524441600

Keys, untraceable how many.

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Sale 2:

https://backpack.tf/profiles/76561198211034693#!/compare/1528416000/1528502400

https://backpack.tf/profiles/76561198134210779#!/compare/1528416000/1528502400

Sold for Cool BS Turbine Torcher + 4 keys

Use there.

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Sale 3:

https://backpack.tf/profiles/76561198110467057#!/compare/1528502400/1528588800

Untraceable. ALT?

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Sale 4:

https://backpack.tf/profiles/76561198110467057#!/compare/1528588800/1528675200

https://backpack.tf/profiles/76561198050933686#!/compare/1528588800/1528675200

Sold with SGG ISY(5) for Cauldron Virtual

Virtual Mini:

https://backpack.tf/profiles/76561198074924284#!/compare/1527724800/1527897600

https://backpack.tf/profiles/76561198157621024#!/compare/1527292800/1527897600

Sold for 20 keys.

Total is 15 keys.

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Sale 5

https://backpack.tf/profiles/76561198068294212#!/compare/1524355200/1524441600

https://backpack.tf/profiles/76561198206255569#!/compare/1524355200/1524441600

Sold with ~7 keys in sweets for Surge Bonk Helm

Better used there.

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Sale 6:

https://backpack.tf/profiles/76561198206255569#!/compare/1524441600/1524787200

https://backpack.tf/profiles/76561198044373580#!/compare/1524700800/1524787200

Sold with ~7 keys in sweets for DP Base Metal + Aussie Black Box.

Both QS for pure, taking ~20 keys in pure.

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Sale 7:

https://backpack.tf/profiles/76561198044373580#!/compare/1524960000/1525046400

https://backpack.tf/profiles/76561198161625387#!/compare/1524960000/1525046400

Sold for TFL Blast Defense

Defense Mini:

https://backpack.tf/profiles/76561198181432645#!/compare/1528848000/1528934400

Sold for 12 keys

Total is 12 keys.

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Sale 8:

https://backpack.tf/profiles/76561198009583885#!/compare/1524960000/1525046400

https://backpack.tf/profiles/76561198085126938#!/compare/1524960000/1525046400

Sold for Smoking Muffs plus ~5 keys in sweets (Ranger, Key, + Surgeon)

Muffs Mini:

https://backpack.tf/profiles/76561198263170083#!/compare/1524528000/1524614400

Sold for 21 keys.

Total is 26 keys.

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Sale 9:

https://backpack.tf/profiles/76561198219200107#!/compare/1528243200/1528329600

https://backpack.tf/profiles/76561197960984512#!/compare/1528243200/1528329600

Sold for Steaming Mullet + Cyclone Wanted(5.5) + MW Shred(8) + ~7 keys in sweets

Unable to mini Mullet.

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Sale 10:

https://backpack.tf/profiles/76561197960984512#!/compare/1528329600/1528416000

https://backpack.tf/profiles/76561198815852225#!/compare/1528416000/1528588800

Sold for OF Mountain Cap + 1.3 keys in sweets

Mountain Cap Mini:

https://backpack.tf/suggestion/5b22cb0f44325a31610fa35a

Suggestion on Cap for 18 keys.

Total is 19.3 keys.

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K1NG'S Part:

Sale 6 isn't 20 keys if 7 keys were added in sweets with the Bucket. OF Mountain Cap is now 15.5, so sale 10 is now 17. Other sales:

Not entirely sure, but probably supports ~15

https://backpack.tf/profiles/76561198241890934#!/compare/1532217600/1532304000

https://backpack.tf/profiles/76561198814019501#!/compare/1532131200/1532390400

Bulk

https://backpack.tf/profiles/76561198241890934#!/compare/1530230400/1530316800

SCM

https://backpack.tf/profiles/76561197984196383#!/compare/1530057600/1530748800

https://backpack.tf/profiles/76561198168966583#!/compare/1528070400/1531008000

Steaming Panama + Flies Bucket (minis needed)

https://backpack.tf/profiles/76561198121744206#!/compare/1529452800/1529539200

https://backpack.tf/profiles/76561198264263249#!/compare/1529280000/1529452800

http://www.tf2outpost.com/trade/29688003 ----- B/O was 19

Panama Mini:

https://backpack.tf/suggestion/5b5cd74ecf6c752c516bce35

Suggestion for 8.75 keys

Bucket Mini:

https://backpack.tf/suggestion/5b5d0b9dcf6c7531fa4bc2cb

Suggestion for 9.5 keys

Total is 18.25 keys

Taking range of 15-18 keys.