Sale 1:

https://backpack.tf/profiles/76561198144840227#!/compare/1523318400/1523577600

https://backpack.tf/profiles/76561198166102098#!/compare/1523318400/1523577600

Bulk.

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Sale 2:

https://backpack.tf/profiles/76561198166102098#!/compare/1523923200/1524096000

Sold for 20 pure.

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Sale 3:

https://backpack.tf/profiles/76561198171094499#!/compare/1524268800/1524355200

Sold for Strange PDA(9.73)?

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Sale 4:

https://backpack.tf/profiles/76561198171094499#!/compare/1525305600/1525392000

https://backpack.tf/profiles/76561198212611445#!/compare/1525219200/1525305600

Sold for Showstopper Flippin'

Flippin Mini:

https://marketplace.tf/items/1107;5;u3001

Sales for 29.99, 32.81, 22

Totals are 15.22, 16.65, 11.22 keys

https://backpack.tf/profiles/76561198212611445#!/compare/1524614400/1524787200

Sold for 13 keys

Taking 13 flat on account of seller of 14.

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Sale 5:

https://backpack.tf/profiles/76561198212611445#!/compare/1525478400/1525564800

https://backpack.tf/profiles/76561198063640894#!/compare/1525478400/1525564800

Sold with 1.45 keys in sweets for Isotope BS Bloom Buffed Knife

Unable to mini knife

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Sale 6:

https://backpack.tf/profiles/76561198063640894#!/compare/1525564800/1525651200

https://backpack.tf/profiles/76561198018653729#!/compare/1525564800/1525651200

Sold for Blizzardy Kabuto + Spectral Burstchester + ~15.34 keys in sweets

Burst mini:

https://backpack.tf/profiles/76561198085269574#!/compare/1525046400/1525132800

Sold for ~20 keys in items

https://backpack.tf/profiles/76561198063640894#!/compare/1527206400/1527292800

Sold for ST Posedown + 3 keys

Posedown Micro:

https://marketplace.tf/items/30616;5;u3006

3 sales for ~15 keys each.

Total is 18 keys.

Taking 18-20 keys, average of 19.

Kabuto Mini:

https://backpack.tf/profiles/76561198060533127#!/compare/1527811200/1528156800

Sold for 23 keys.

https://backpack.tf/profiles/76561198830746853#!/compare/1527811200/1527897600

https://backpack.tf/profiles/76561198119425973#!/compare/1527811200/1527897600

Sold for 23 keys

Taking 23 keys.

Total is 23 + 19 + 15.34 = 57.34 keys

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Sale 7:

https://backpack.tf/profiles/76561198018653729#!/compare/1525996800/1526083200

https://backpack.tf/profiles/76561198170107381#!/compare/1525996800/1526083200

Sold with 15.61 ref in sweets for C9 Drill Hat

https://backpack.tf/suggestion/5b1e7bc4cf6c75396b61a676

Suggestion for 26 keys.

Total is 25.44 keys.

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Sale 8:

https://backpack.tf/profiles/76561198170107381#!/compare/1528156800/1528329600

https://backpack.tf/profiles/76561198076061300#!/compare/1528243200/1528329600

Sold for 27 pure.

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Sale 9:

https://backpack.tf/profiles/76561198095433407#!/compare/1527379200/1527638400

https://backpack.tf/profiles/76561198362048870#!/compare/1527638400/1527724800

Sold for HG Hoodie + 2 keys

Unable to mini Hoodie, use there.

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Sale 10:

https://backpack.tf/profiles/76561198362048870#!/compare/1527984000/1528070400

https://backpack.tf/profiles/76561198143304035#!/compare/1527811200/1527984000

Untraceable

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Total sales @:

9.73, 13, 20, 25.44, 27, 57.34

Going with 20 - 27 keys, other sales have larger ranges (and range encompasses two pure sales).