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Sale 1:
https://backpack.tf/profiles/76561198061489334#!/compare/1594166400/1594252800
https://backpack.tf/profiles/76561198062791227#!/compare/1594166400/1594339200
Marketplace.tf: https://marketplace.tf/items/tf2/31049;5;u15
Sale 2:
May 5 - $27 / $1.88 = 14.36 keys, No B/O
= 14 Keys.
Sale 3:
May 14 - $14 / $1.90 = 7.37 keys, No B/O
= 7.5 Keys, QS
Sale 4:
Jun 3 - $24.95 / $1.96 = 12.73 keys, No B/O
= 13 Keys.
Sales: 7.5, 13, 14
Going with 13-14 keys.