Choo Choo. Car 15.

Sale 1:

https://backpack.tf/profiles/76561198337734785#!/compare/1530662400/1530748800

https://backpack.tf/profiles/76561198031329332#!/compare/1530403200/1530748800

Untrace.

Sale 2:

https://backpack.tf/profiles/76561198031329332#!/compare/1530748800/1531008000

https://backpack.tf/profiles/76561198089808211#!/compare/1530835200/1530921600

Sold for Smoking Sky High(8.5)

Sale 3:

https://backpack.tf/profiles/76561198089808211#!/compare/1531008000/1531353600

https://backpack.tf/profiles/76561198099292422#!/compare/1530230400/1531440000

Sold for 8 keys + 15 ref

Sale 4:

https://backpack.tf/profiles/76561198308819102#!/compare/1532649600/1532736000

https://backpack.tf/profiles/76561198171466414#!/compare/1532131200/1532822400

Untrace.

Sale 5:

https://backpack.tf/profiles/76561198171466414#!/compare/1532131200/1532822400

https://backpack.tf/profiles/76561198086537722#!/compare/1531785600/1532822400

Untrace.

Sale 6:

https://backpack.tf/profiles/76561198308819102#!/compare/1533686400/1533772800

Sold for 8 keys + 13 ref

Sale 7:

https://backpack.tf/profiles/76561198381033764#!/compare/1533772800/1533859200

https://backpack.tf/profiles/76561198238489244#!/compare/1533686400/1533772800

Sold for Bubbling Pride(8)

Sale 8:

https://backpack.tf/profiles/76561198238489244#!/compare/1533772800/1533945600

Untrace.

Sale 9:

https://backpack.tf/profiles/76561198439812057#!/compare/1533859200/1533945600

https://backpack.tf/profiles/76561198267589362#!/compare/1533859200/1533945600

Bulk.

Sale 10:

https://backpack.tf/profiles/76561198267589362#!/compare/1533945600/1534032000

https://backpack.tf/profiles/76561198286485732#!/compare/1533945600/1534032000

Sold for keys, cannot trace.

Sale 11:

https://backpack.tf/profiles/76561198407968483#!/compare/1533254400/1534032000

Untrace.

Sale 12, 13, 14, 15:

https://marketplace.tf/items/249;5;u36

Sold for 8.31, 8.30, 9.47, 9.47 keys

Total sales @:

8, 8.30, 8.31, 8.40, 8.46, 8.5, 9.47, 9.47

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

Buyers up to 7 keys

Unsold for a few months at 9

Fair listing at ~8.5 keys

Lets go with 8 - 8.5 keys.