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Sale 1:
https://backpack.tf/profiles/76561198341171690#!/compare/1588896000/1588982400 => 8772248424
https://backpack.tf/profiles/76561198870235149#!/compare/1582156800/1589155200
= 15 Keys.
Marketplace.tf: https://marketplace.tf/items/tf2/31025;5;u29
Sale 2:
May 3 - $25 / $1.87 = 13.37 keys, No B/O
= 13 Keys.
Sale 3:
May 11 - $24.99 / $1.90 = 13.15 keys, No B/O
= 13 Keys.
Sale 4:
Jul 1 - $28.89 / $2.02 = 14.30 keys, B/O
= 14 Keys.
Sales: 13, 13, 14, 15
Going with 13-15 keys.