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Sale #1:

12 keys pure

Seller's backpack: http://backpack.tf/profiles/76561198066110534#!/compare/1466726400/1466899200

12 keys

Sale #2:

11 keys pure

Seller's backpack: http://backpack.tf/profiles/76561198072004839#!/compare/1466294400/1466553600

11 keys

Sale #3:

11 keys pure

Buyer's backpack: http://backpack.tf/profiles/76561198072004839#!/compare/1465948800/1466035200

11 keys

Sale #4:

15 keys pure (OUTLIER)

Buyer's backpack: http://backpack.tf/profiles/76561198126503193#!/compare/1466899200/1468454400

15 keys

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Final price: 11-12 keys

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Thanks!