Sale #1:

https://backpack.tf/profiles/76561198010707003#!/compare/1546214400/1546300800

Sold for 10 keys

10 keys

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Sale #2:

https://backpack.tf/profiles/76561198392181664#!/compare/1547164800/1547251200

Sold for 9 keys

9 keys

Very slow to sell at 11 keys, ~20 days with no sales. 9 keys is too low as buyers are higher.