Sale 1:

https://backpack.tf/item/2539159946

Scammed

Sale 2:

https://backpack.tf/profiles/76561198051639182#!/compare/1549324800/1550016000

https://backpack.tf/profiles/76561198268885671#!/compare/1549929600/1550102400

Untrace

Sale 3:

https://backpack.tf/profiles/76561198201339157#!/compare/1552780800/1552867200

https://backpack.tf/profiles/76561198415535845#!/compare/1552780800/1552867200

https://backpack.tf/profiles/76561198255263276#!/compare/1552780800/1552867200

Possible scam then untrace

Sale 4:

https://backpack.tf/profiles/76561198255263276#!/compare/1552953600/1553040000

https://backpack.tf/profiles/76561198055622215#!/compare/1552953600/1553040000

Bulk

Sale 5:

https://backpack.tf/profiles/76561198055622215#!/compare/1553299200/1553472000

https://backpack.tf/profiles/76561198337734785#!/compare/1553385600/1553472000

QS

Sale 6:

https://backpack.tf/profiles/76561198337734785#!/compare/1555113600/1555200000

https://backpack.tf/profiles/76561198273866103#!/compare/1555113600/1555200000

Untrace, keys?

Sale 7:

https://backpack.tf/profiles/76561198077099773#!/compare/1551052800/1551139200

https://backpack.tf/profiles/76561198337734785#!/compare/1551052800/1551139200

Bulk

Sale 8:

https://backpack.tf/profiles/76561198337734785#!/compare/1551571200/1551657600

https://backpack.tf/profiles/76561198021458180#!/compare/1551571200/1551657600

Sold for 14 keys

Sale 9:

https://backpack.tf/profiles/76561198021458180#!/compare/1552176000/1552780800

https://backpack.tf/profiles/76561198337734785#!/compare/1552694400/1552780800

QS for 11 keys

Sale 10:

https://backpack.tf/profiles/76561198337734785#!/compare/1554163200/1554249600

https://backpack.tf/profiles/76561198287594985#!/compare/1554163200/1554249600

Sold for 13 keys

Sale 11:

https://backpack.tf/profiles/76561198287594985#!/compare/1554249600/1554336000

https://backpack.tf/profiles/76561198154700747#!/compare/1554249600/1554336000

Sold for ~11 keys

sale 12:

https://backpack.tf/profiles/76561198154700747#!/compare/1554422400/1554422400/nearest

https://backpack.tf/profiles/76561198387030375#!/compare/1554422400/1554768000

Untrace

Sale 13 - 15:

https://marketplace.tf/items/935;5;u61

$18.00 / $1.79 = 10.06 keys

$29.99 / $1.8 = 16.66 keys

$24.44 / $1.78 = 13.73 keys

Total sales @:

10.06, 11, 11, 13, 13.73, 14, 16.66 keys

buyers up to 11 keys,

gonna call 16.66 high,

11 low,

taking 13 - 14 keys.