Third time is the charm

Thanks to Erik and Blaze for the help.

First Suggestion. Hopefully I did this right.

First sale:

https://backpack.tf/profiles/76561198269636307#!/compare/1550620800/1550707200

Sold for a Smoking Field Practice (18.5), Giger Counter (2 keys), 2 pure keys, and 22 ref

Adds up to 23 keys.

Second Sale:

https://backpack.tf/profiles/76561198269636307#!/compare/1550707200/1550880000

https://backpack.tf/profiles/76561198355520251#!/compare/1550793600/1550880000

Sold for Spectral Swirl Skullcracker + 11 keys pure.

https://imgur.com/l4UXLRZ Guy who sold the Strontium

Mini for taunt:

https://backpack.tf/profiles/76561198415180580#!/compare/1550793600/1550880000

Sold for 16

27 key sale

Third Sale:

https://backpack.tf/profiles/76561198837526031#!/compare/1550620800/1550707200

https://backpack.tf/profiles/76561198148836514#!/compare/1550620800/1550707200

Sold for a Nuts n’ Bolts Hound Dog, 4 pure keys, and a Festive Grenade Launcher (12 ref)

Mini for the Hound Dog:

https://marketplace.tf/items/145;5;u31

Sold on January 29 for 22.49

Keys at that time were $1.80 Marketplace key prices

22.49/1.80= 12.49

Rounding to 12.5

Around a 16.6 key sale

Marketplace.tf sale:

https://marketplace.tf/items/30037;5;u9

40/1.79= 22.35 keys

Last sale

https://backpack.tf/profiles/76561198097135729#!/compare/1550361600/1551139200

A clean trade for 20 keys pure

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Blaze Suggesting I consider the 16.6 key sale and 27 key sale outliers.

So now we have 20, 22.35, and 23

I'm gonna make it 20-23