Resuggestion due to more sales and new sellers.

Sale 1:

https://backpack.tf/profiles/76561198261509772#!/compare/1532995200/1533081600

https://backpack.tf/profiles/76561198087795898#!/compare/1532995200/1533081600

Sold for 14 keys + ~1 key in sweets

Total is 15 keys.

Sale 2:

https://backpack.tf/profiles/76561198087795898#!/compare/1532995200/1533081600

https://backpack.tf/profiles/76561198030343929#!/compare/1532995200/1533081600

Untrace.

Sale 3:

https://backpack.tf/profiles/76561198305676157#!/compare/1531094400/1531180800

https://backpack.tf/profiles/76561198071012049#!/compare/1531008000/1531094400

Keys, untrace.

Sale 4:

https://backpack.tf/profiles/76561198065409820#!/compare/1527552000/1527811200

https://backpack.tf/profiles/76561197998022978#!/compare/1527465600/1527811200

Untrace.

Sale 5:

https://backpack.tf/profiles/76561198065409820#!/compare/1527897600/1527984000

https://backpack.tf/profiles/76561198098563620#!/compare/1527897600/1527984000

Untrace.

Sale 6:

https://backpack.tf/profiles/76561198098563620#!/compare/1527897600/1527984000

https://backpack.tf/profiles/76561198194019015#!/compare/1527379200/1527984000

Sold with Beep Man(8.5) for Strange Dead Head(27)

Total is 18.5 keys

Sale 7:

https://backpack.tf/profiles/76561198080310253#!/compare/1528675200/1528761600

https://backpack.tf/profiles/76561198055847835#!/compare/1528675200/1528761600

Count 28 keys, considering current listing for 20 keys, calling high.

Sale 8:

https://backpack.tf/profiles/76561198305676157#!/compare/1527206400/1527292800

https://backpack.tf/profiles/76561198400127576#!/compare/1525392000/1527379200

Untrace.

Sale 9:

https://marketplace.tf/items/30984;5;u62

Sold for 30 USD

Keys at 1.94

Total is 15.46 keys

Sale 10:

https://backpack.tf/profiles/76561198084831431#!/compare/1535068800/1535846400

https://backpack.tf/profiles/76561198093229614#!/compare/1535328000/1535932800

Sold for Pro KS Cow Mangler + 3 keys. Low.

Sale 11:

https://backpack.tf/profiles/76561198030343929#!/compare/1534377600/1534464000

https://backpack.tf/profiles/76561198310374315#!/compare/1534377600/1534464000

Sold for 7 keys + ~9 keys in sweets

Total is 16 keys

Sale 12:

https://backpack.tf/profiles/76561198310374315#!/compare/1534550400/1534809600

https://backpack.tf/profiles/76561198088089280#!/compare/1534636800/1534982400

Cannot trace.

Sale 13:

https://backpack.tf/profiles/76561198088089280#!/compare/1534982400/1536624000

https://backpack.tf/profiles/76561198302201202#!/compare/1535155200/1535846400

Untrace.

Sale 14:

https://backpack.tf/profiles/76561198302201202#!/compare/1535155200/1535846400

https://backpack.tf/profiles/76561197995232897#!/compare/1534982400/1535155200

Cannot trace.

Sale 15:

https://backpack.tf/profiles/76561197995232897#!/compare/1535328000/1535587200

https://backpack.tf/profiles/76561198088391137#!/compare/1535500800/1535587200

https://backpack.tf/profiles/76561198111322090#!/compare/1535587200/1535673600

Cannot trace.

Sale 16:

https://backpack.tf/item/6978475658

Not using the sales (if they are) from Lovely to zzz & Doggo. Look like ALTS.

Sale 17:

https://backpack.tf/profiles/76561198179253523#!/compare/1536451200/1536537600

Can't trace.

Sale 18:

https://backpack.tf/profiles/76561198121830870#!/compare/1536451200/1536624000

Untrace / QS

Total sales @:

15, 15.46, 18.5

Buyers up to 11 keys.

Let's go with 15 - 19 keys, as 16 sellers have sold.