Sale 1: Untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1550534400/1550620800

https://backpack.tf/profiles/76561198046580198#!/compare/1550534400/1550620800

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Sale 2: Untrace

https://backpack.tf/profiles/76561198046580198#!/compare/1550880000/1551052800

https://backpack.tf/profiles/76561198005032783#!/compare/1550880000/1550966400

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Sale 3: (Bulk)

https://backpack.tf/profiles/76561198197215790#!/compare/1553558400/1553644800

https://backpack.tf/profiles/76561198139656272#!/compare/1553558400/1553644800

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Sale 4: ~12 Keys.

https://backpack.tf/profiles/76561198125791160#!/compare/1548979200/1549065600

https://backpack.tf/profiles/76561198032176942#!/compare/1548979200/1549065600

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Sale 5: Untrace

https://backpack.tf/profiles/76561198032176942#!/compare/1549065600/1549152000

https://backpack.tf/profiles/76561198029000785#!/compare/1547078400/1550361600

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Sale 6: Untrace

https://backpack.tf/profiles/76561198312583107#!/compare/1550534400/1553212800

https://backpack.tf/profiles/76561198032176942#!/compare/1550534400/1550620800

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Sale 7: Untrace

https://backpack.tf/profiles/76561198060363810#!/compare/1550534400/1550880000

https://backpack.tf/profiles/76561198005032783#!/compare/1550534400/1550793600

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Sale 8: Untrace

https://backpack.tf/profiles/76561198168863803#!/compare/1548892800/1549065600

https://backpack.tf/profiles/76561197999751332#!/compare/1548892800/1548979200

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Sale 9: Untrace

https://backpack.tf/profiles/76561197999751332#!/compare/1548979200/1549670400

https://backpack.tf/profiles/76561198364730989#!/compare/1549238400/1549670400

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Sale 10: Untrace

https://backpack.tf/profiles/76561198364730989#!/compare/1549670400/1550793600

https://backpack.tf/profiles/76561198074856827#!/compare/1549670400/1550534400

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Sale 11: ~20 Keys.

https://marketplace.tf/items/31000;5;u112 (Jan 23, 19)

$35.88 / $1.75 = 20.50 keys

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Sale 12: ~20 Keys.

https://marketplace.tf/items/31000;5;u112 (Jan 27, 19)

$36.00 / $1.78 = 20.22 keys

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Sale 13: ~20 Keys.

(Feb 11, 19)

$36.00 / $1.79 = 20.11 keys

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Sale 14: ~20 Keys

(Feb 16, 19)

$36.00 / $1.8 = 20.00 keys

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Sale 15: ~21 Keys.

(Feb 20, 19)

$38.00 / $1.79 = 21.23 keys

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Sale 16: ~18 Keys.

(Feb 22, 19)

$32.00 / $1.81 = 17.68 keys

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Sale 17

https://backpack.tf/profiles/76561198060616510#!/compare/1557446400/1557532800

https://backpack.tf/profiles/76561197964171516#!/compare/1557360000/1557446400

Sold with a Clairvoyance High Way Star (16) for a Sunbeams Ketche (25.5)= 9.5 Keys, obviously low

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Sale 18

https://backpack.tf/profiles/76561198341171690#!/compare/1557273600/1557360000

https://backpack.tf/profiles/76561198060616510#!/compare/1557360000/1557446400

only 2 Keys match according to near ID

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Sale 19

https://backpack.tf/profiles/76561198803159222#!/compare/1554163200/1554249600

https://backpack.tf/profiles/76561198341171690#!/compare/1554163200/1554249600

probably sold to buyer for 11 Pure

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Sale 20

https://backpack.tf/profiles/76561198160248914#!/compare/1554076800/1554249600

https://backpack.tf/profiles/76561198803159222#!/compare/1554163200/1554249600

Sold for 13 Pure + 23 ref, rounding to 13 Keys.

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Sale 21

https://backpack.tf/profiles/76561198160248914#!/compare/1553558400/1554076800

https://backpack.tf/profiles/76561198076804761#!/compare/1553990400/1554076800

13 pure matches

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Going with 13-20 according to Polar

https://backpack.tf/suggestion/5c9f8e816780721a8f379ba1#comment-5cde913e67807224214b5d05