Resuggestion

Sale 1: ~18 Keys Pure.

https://backpack.tf/profiles/76561198092453686#!/compare/1548979200/1549152000

https://backpack.tf/profiles/76561198122663124#!/compare/1548633600/1549238400

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Sale 2: Untrace.

https://backpack.tf/profiles/76561198122663124#!/compare/1549238400/1551139200

https://backpack.tf/profiles/76561198337734785#!/compare/1549152000/1549238400

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Sale 3: ~16 Keys Pure.

https://backpack.tf/profiles/76561198064982470#!/compare/1548806400/1548979200

https://backpack.tf/profiles/76561198442218271#!/compare/1548720000/1549065600

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Sale 4: Untrace/Low.

https://backpack.tf/profiles/76561198442218271#!/compare/1548979200/1549756800

https://backpack.tf/profiles/76561198267189538#!/compare/1549497600/1549756800

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Sale 5: Sold for The Cuban Bristle Crisis (8.66 ref), Veterans Attire (1.05 keys), Strange Festivized Specialized Killstreak Backwoods Boomstick Shotgun (Field-Tested) (19.44 ref), Strange Specialized Killstreak Backburner (32. 44 ref) https://imgur.com/kajJRoV.

Terror-Watt Liquidator's Lid. (Use there)

https://backpack.tf/profiles/76561198267189538#!/compare/1549756800/1550016000

https://backpack.tf/profiles/76561198815194876#!/compare/1549843200/1550102400

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Sale 6: Use there.

https://backpack.tf/profiles/76561198815194876#!/compare/1551484800/1551571200

https://backpack.tf/profiles/76561198125791160#!/compare/1551484800/1551657600

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Sale 7: Sold With 5 Keys For Disco Beat Down Liquidator's Lid (19.5).

https://backpack.tf/profiles/76561198314620824#!/compare/1550275200/1550448000

https://backpack.tf/profiles/76561198282969436#!/compare/1550016000/1550448000

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Sale 8: Untrace.

https://backpack.tf/profiles/76561198282969436#!/compare/1550361600/1550620800

https://backpack.tf/profiles/76561198101327173#!/compare/1550361600/1552867200

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Sale 9: ~17 Keys.

https://backpack.tf/profiles/76561198101327173#!/compare/1550534400/1550620800

https://backpack.tf/profiles/76561198211648209#!/compare/1550534400/1550620800

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Sale 10: Untrace.

https://backpack.tf/profiles/76561198211648209#!/compare/1550620800/1550966400

https://backpack.tf/profiles/76561198336633071#!/compare/1550534400/1550707200

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Sale 11: Untrace.

https://backpack.tf/profiles/76561198121830870#!/compare/1550620800/1550793600

https://backpack.tf/profiles/76561198811281791#!/compare/1550620800/1553212800

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Sale 12: Untrace.

https://backpack.tf/profiles/76561198811281791#!/compare/1550966400/1553558400

https://backpack.tf/profiles/76561198148836514#!/compare/1550966400/1551052800

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Sale 13:

https://backpack.tf/profiles/76561198148836514#!/compare/1551052800/1551139200

https://backpack.tf/profiles/76561198298232556#!/compare/1551139200/1551225600

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Sale 14: Untrace.

https://backpack.tf/profiles/76561198298232556#!/compare/1551225600/1551312000

https://backpack.tf/profiles/76561198021055079#!/compare/1551225600/1551312000

Sales 17/16/18/20

16 only took about 6 days, calling it low and going with 17-18