Sale 1:

https://backpack.tf/profiles/76561198011321852#!/compare/1530403200/1530489600

Untrace, probs QS?

Sale 2:

https://backpack.tf/profiles/76561198217280904#!/compare/1534204800/1534291200

https://backpack.tf/profiles/76561197975587947#!/compare/1534204800/1534291200

Sold with 3 keys for Strange Bubbling Private Eye

Use there.

Sale 3:

https://backpack.tf/profiles/76561198133015547#!/compare/1534204800/1534291200

Sold for 7 keys

Sale 4:

https://backpack.tf/profiles/76561198309332284#!/compare/1533686400/1533772800

Sold for 8 keys

Sale 5:

https://backpack.tf/profiles/76561198273946455#!/compare/1533513600/1533772800

https://backpack.tf/profiles/76561198061990233#!/compare/1533686400/1533772800

Sold for 8 keys + 17 ref

Sale 6:

https://backpack.tf/profiles/76561198061990233#!/compare/1533772800/1533859200

Probably sold for 10 keys, can't prove.

Sale 7:

https://backpack.tf/profiles/76561197971209234#!/compare/1533772800/1533859200

Untrace / can't prove.

Sale 8:

https://backpack.tf/profiles/76561197971209234#!/compare/1533945600/1534032000

https://backpack.tf/profiles/76561198819564432#!/compare/1533945600/1534032000

ALT trade?

Sale 9:

https://backpack.tf/profiles/76561197971209234#!/compare/1533945600/1534291200

https://backpack.tf/profiles/76561198093765664#!/compare/1533945600/1534032000

Maybe for taunt? Can't prove.

Sale 10:

https://backpack.tf/profiles/76561198093765664#!/compare/1533945600/1534032000

https://backpack.tf/profiles/76561198407566220#!/compare/1533945600/1534032000

Sold for OF Gym Rat(9.5)

Sale 11:

https://backpack.tf/profiles/76561198407566220#!/compare/1533945600/1534032000

https://backpack.tf/profiles/76561198261498191#!/compare/1534032000/1534636800

Sold for 8 keys + ~2 keys in sweets

Total is 10 keys

Sale 12:

https://backpack.tf/profiles/76561198261498191#!/compare/1534636800/1534723200

https://backpack.tf/profiles/76561198080310253#!/compare/1534550400/1534636800

Low / bulk?

Sale 13, 14, 15:

https://marketplace.tf/items/30984;5;u59

Sold for 18, 14, 19 USD

Keys at 1.96, 1.96, 1.93 USD

Total is 9.18, 7.14, 9.84 keys

Total sales @:

7,

7.14,

8,

8.52,

9.18,

9.5,

9.84,

10

Buyers up to ~7.27 keys

Sellers down to 8, unsold for 10 for 2 months

https://i.imgur.com/0xeJvfI.jpg

https://backpack.tf/item/7033132388

https://backpack.tf/item/7032032485

https://backpack.tf/item/6967373823

8 key sellers are young, let's go with 8 - 10 keys.