Sale 1: ~14 Keys Pure.

https://backpack.tf/profiles/76561198011321852#!/compare/1554076800/1554163200

https://backpack.tf/profiles/76561198103226493#!/compare/1553644800/1554163200

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Sale 2: ~12 Keys Pure.

https://bot.tf/stats/item?def=152&q=5&ef=Nuts+n%27+Bolts&craft=1&aus=0&ks=0

https://backpack.tf/profiles/76561198315588518#!/compare/1552348800/1552435200

https://backpack.tf/profiles/76561198087462179#!/compare/1552003200/1552521600

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Sale 3: Untrace. (SCM)

https://backpack.tf/profiles/76561198087462179#!/compare/1552521600/1553817600

https://backpack.tf/profiles/76561198003920441#!/compare/1552435200/1552780800

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Sale 4: Untrace. (SCM)

https://backpack.tf/profiles/76561198003920441#!/compare/1553990400/1554681600

https://backpack.tf/profiles/76561198070055324#!/compare/1553904000/1554768000

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Sale 5: ~12 Keys Pure.

https://backpack.tf/profiles/76561198260686830#!/compare/1557446400/1557532800

https://backpack.tf/profiles/76561198172198154#!/compare/1557446400/1557532800

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

Sale 6: Used there.

Sold For Dead Presidents Madame Dixie + Non-Craftable After Eight (1.3) + 1 Key.

https://backpack.tf/profiles/76561198172198154#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198439087786#!/compare/1557446400/1557619200

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Sale 7: Seems Low.

https://backpack.tf/profiles/76561198439087786#!/compare/1557619200/1558051200

https://backpack.tf/profiles/76561198301336678#!/compare/1557964800/1558051200

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Sale 8: Untrace.

https://backpack.tf/profiles/76561198301336678#!/compare/1558051200/1558137600

https://backpack.tf/profiles/76561198165205268#!/compare/1558051200/1558137600

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Including Sales: 12/12/14

Going With 12-14 Keys.

Thanks to scourge for the premium!