Marketplace.tf Sales:

https://marketplace.tf/items/219;5;u18

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Sale 1: ~15 Keys.

Feb 27

$26.00 / $1.79 = 14.53 keys

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Sale 2: ~16 Keys.

Mar 24

$28.00 / $1.8 = 15.56 keys

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Sale 3: ~12 Keys. (QS)

Apr 20

$21.99 / $1.78 = 12.35 keys

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Including Sales: 15/16

Going With 15-16 Keys.

Thanks to scourge for the premium!