Wow suggesting has really gotten far.

SALE 1

Some kind of bulk deal

https://backpack.tf/profiles/76561198089253101#!/compare/1563580800/1563753600

https://backpack.tf/profiles/76561198090956917#!/compare/1563667200/1563753600

SALE 2

Not sure

https://backpack.tf/profiles/76561198274006629#!/compare/1564185600/1565740800

https://backpack.tf/profiles/76561198069736364#!/compare/1565395200/1565481600

SALE 3

Sold for 5 keys + bills hat

https://backpack.tf/profiles/76561198260665360#!/compare/1559952000/1560902400

https://backpack.tf/profiles/76561198094618694#!/compare/1559865600/1559952000

5 + 1.85 = 6.85 rounding to 7 keys

SALE 4

Sold with 9 refined worth of hats for 9 keys

https://backpack.tf/profiles/76561198094618694#!/compare/1559865600/1559952000

https://backpack.tf/profiles/76561198254620348#!/compare/1559865600/1559952000

Rounds to 9 keys

SALE 5

Sold for 8 keys + 3.11 refined

https://backpack.tf/profiles/76561198254620348#!/compare/1559952000/1560038400

https://backpack.tf/profiles/76561198105500752#!/compare/1559952000/1560038400

Rounds down to 8 keys

SALE 6

Sold for 8 keys + 9 refined + frying pan (second compare link 8 keys match up)

https://backpack.tf/profiles/76561198121830870#!/compare/1561420800/1561507200

https://backpack.tf/profiles/76561198186042099#!/compare/1561420800/1561507200

Rounds down to 8 keys

SALE 7

Unknown

https://backpack.tf/profiles/76561198332502222#!/compare/1558137600/1559692800

https://backpack.tf/profiles/76561198132562943#!/compare/1558742400/1559520000

SALE 8

Sold to known quickbuyer for unknown

https://backpack.tf/profiles/76561198132562943#!/compare/1560124800/1560297600

https://backpack.tf/profiles/76561198080179568#!/compare/1560211200/1560297600

SALE 9

Unknown

https://backpack.tf/profiles/76561198154782261#!/compare/1564704000/1564790400

https://backpack.tf/profiles/76561198318361156#!/compare/1564704000/1564790400

SALE 10

Sold for 10 keys

https://backpack.tf/profiles/76561198318361156#!/compare/1565395200/1565481600

https://backpack.tf/profiles/76561198286907559#!/compare/1565395200/1565481600

MARKETPLACE SALES

19.99 on july 16 (19.99 / 1.82 = 10.98 rounding to 11 keys)

18.89 on july 25 (18.89 / 1.81 = 10.43 rounding to 10 keys)

https://marketplace.tf/items/tf2/30093;5;u56

CLASSIFIEDS

https://gyazo.com/322ae878c40490d9166652eec2a6fee0

Sales at 7, 8, 8, and 9. Marketplace sales at 10 and 11.

Due to buyers at 7 and higher, 7 is obviously low. Taking 8-11 keys.