16 keys: 2 sellers, listed 3 months ago. Nope.

https://ibb.co/eiggVQ <-screenshot

Sales:

Got a few sales equal or lower than current buy orders (~10-11 keys pure or in items), and a couple of untrasable sales.

QS:

10

https://backpack.tf/profiles/76561198024867201#!/compare/1500076800/1500163200

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11

https://backpack.tf/profiles/76561198061899091#!/compare/1496188800/1496275200

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Pro KS Australium smg (~10)

https://backpack.tf/profiles/76561198188786945#!/compare/1501372800/1501459200

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Sold mine to the bot for 11 keys + 5 or 6 ref.

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Usable sales here:

12 keys, Joshua -> Roque

https://backpack.tf/item/3304232601

https://backpack.tf/profiles/76561198271907409#!/compare/1500422400/1500681600

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12 keys and ~7 ref

https://backpack.tf/profiles/76561198345004973#!/compare/1501459200/1501545600

Keys are not shown in the 2nd participant's inventory, but he has unus that costs 12, bought from exchanger

https://backpack.tf/item/3704382820

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13

Marketplace sale: 27 / 2,03 = 13,3

https://marketplace.tf/items/1116;5;u3016

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15 keys

https://backpack.tf/profiles/76561198054601655#!/compare/1499990400/1500163200