Sale 1:

https://backpack.tf/profiles/76561198313754325#!/compare/1530230400/1530316800

Sold for 13 keys...

Not using cause suspicious.

Sale 2:

https://backpack.tf/profiles/76561198304138933#!/compare/1529539200/1529625600

https://backpack.tf/profiles/76561198157181360#!/compare/1529452800/1529625600

Untrace.

Sale 3:

https://backpack.tf/profiles/76561198054758757#!/compare/1529971200/1530057600

https://backpack.tf/profiles/76561198021529238#!/compare/1529884800/1530057600

Sold for 16 keys

Sale 4:

https://backpack.tf/profiles/76561198054758757#!/compare/1532304000/1532649600

Bulk/untrace.

Sale 5:

https://backpack.tf/profiles/76561198021055079#!/compare/1530835200/1530921600

https://backpack.tf/profiles/76561198407056645#!/compare/1530835200/1530921600

Sold for 18 keys

Sale 6:

https://backpack.tf/profiles/76561198021055079#!/compare/1532908800/1532995200

https://backpack.tf/profiles/76561198109449429#!/compare/1532649600/1532995200

Sold for Tesla Cranial(19) + negligible sweets

B/O of 18 keys

Capping.

Sale 7:

https://backpack.tf/profiles/76561198109449429#!/compare/1532995200/1533081600

https://backpack.tf/profiles/76561198142619531#!/compare/1532995200/1533081600

Bulk.

Sale 8:

https://backpack.tf/profiles/76561198142619531#!/compare/1533168000/1533254400

https://backpack.tf/profiles/76561198165055074#!/compare/1533168000/1533254400

Bulk.

Sale 9:

https://backpack.tf/profiles/76561198165055074#!/compare/1533427200/1533513600\

Sold for 14 keys.

Sale 10:

https://backpack.tf/profiles/76561198005755481#!/compare/1532476800/1532563200

can't trace

Sale 11:

https://marketplace.tf/items/227;5;u29

Sold for 32.49 USD

Keys at 1.96 USD

Total is 16.58 keys

Total sales @:

14, 16, 16.58, 18, 18 keys

https://i.imgur.com/O7lXPDm.png

Buyers up to 10 keys

Unsold for a month at 18. https://backpack.tf/item/1684404509 https://backpack.tf/item/1099452608

Aging seller for 16. https://backpack.tf/item/871721425

However, I don't think 2 successful sales at 18 keys should be ignored right now.

Let's go with 14 - 18 keys, watch 16 seller.