Phew, never pricing low-tiers again D:

Sale #1, Jul 17th:

Seller: https://backpack.tf/profiles/76561198377214184#!/compare/1563321600/1564876800

Buyer: https://backpack.tf/profiles/76561198877220038#!/compare/1562803200/1563408000

Sold with other items to bot. Basically impossible to trace

Untraceable

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Sale #2, Aug 8th:

Seller: https://backpack.tf/profiles/76561198877220038#!/compare/1565136000/1565308800

Buyer: https://backpack.tf/profiles/76561198354627013#!/compare/1565222400/1565308800

Bought from the same bot. Basically impossible to trace again

Untraceable

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Sale #3, Jul 7th:

Seller: https://backpack.tf/profiles/76561198120563084#!/compare/1562457600/1562544000

Buyer?: https://backpack.tf/profiles/76561198069370735#!/compare/1562112000/1562544000

???

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Sale #4, Aug 8th:

Seller: https://backpack.tf/profiles/76561198125022747#!/compare/1565222400/1565308800

Buyer: https://backpack.tf/profiles/76561198337734785#!/compare/1565136000/1565222400

???

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Sale #5, Jul 5th:

Seller: https://backpack.tf/profiles/76561198830746068#!/compare/1562198400/1562284800

Buyer: https://backpack.tf/profiles/76561198227657840#!/compare/1562284800/1562371200

15 keys

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Sale #6, Jul 6th:

Seller: https://backpack.tf/profiles/76561198227657840#!/compare/1562371200/1562457600

Buyer: https://backpack.tf/profiles/76561198830746068#!/compare/1562371200/1562457600

Untraceable, but probably a quicksell as it was sold to a bot

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Sale #7, Jul 7th:

Seller: https://backpack.tf/profiles/76561198325529303#!/compare/1562371200/1562457600

Buyer: https://backpack.tf/profiles/76561198063075911#!/compare/1562371200/1562457600

???

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Sale #8, Jul 10th:

Seller: https://backpack.tf/profiles/76561198081793950#!/compare/1562630400/1562716800

Buyer: https://backpack.tf/profiles/76561198063075911#!/compare/1562371200/1562457600

???

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Sale #9, Jul 11th:

Seller: https://backpack.tf/profiles/76561198089253101#!/compare/1562716800/1562889600

Buyer: https://backpack.tf/profiles/76561198834678807#!/compare/1562284800/1563062400

Sold for T-Watt Hard Counter, not sure if anything else was involved

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Sale #10, Jul 30th:

Seller:https://backpack.tf/profiles/76561198834678807#!/compare/1564444800/1564704000

Buyer: https://backpack.tf/profiles/76561198197200577#!/compare/1559520000/1564531200

???

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Sale #11, Jul 31st:

Seller: https://backpack.tf/profiles/76561198349886701#!/compare/1564531200/1564617600

Buyer: https://backpack.tf/profiles/76561198079990809#!/compare/1564444800/1564617600

10 keys

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Marketplace.tf sales

Sale #12, Jul 6th:

28.59$, keys were 1.85$

Rounding to 15

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Sale #13, Jul 18th:

33.02$, keys were 1.82$

Rounding to 18

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Sale #14, Jul 25th:

23.91$, keys were 1.81$

Rounding to 13

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Sales are at 15, 10, 15, 18, 13

Excluding 10. It's duped and was most likely quicksold

Excluding 18 as an outlier. 2 keys over current price in cash doesn't seem very reasonable.

Taking 13-15