Sale 1: Untrace. (SCM)

https://backpack.tf/profiles/76561198045775820#!/compare/1552521600/1552608000

https://backpack.tf/profiles/76561198136660592#!/compare/1551571200/1553904000

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Sale 2: ~11 Keys Pure.

https://backpack.tf/profiles/76561198085116555#!/compare/1554595200/1554681600

https://backpack.tf/profiles/76561197978814335#!/compare/1554595200/1554681600

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Marketplace.tf Sales:

https://marketplace.tf/items/30977;5;u32

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Sale 4: ~14 Keys.

Apr 15

$24.99 / $1.77 = 14.12 keys

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Usable Sales: 11/14

Going with 11-14 keys.

Thanks to scourge for the premium!