Sale 1:

https://backpack.tf/profiles/76561198070181630#!/compare/1582070400/1582502400

https://backpack.tf/profiles/76561198337734785#!/compare/1582070400/1582156800

QS

sale 2:

https://backpack.tf/profiles/76561198350704417#!/compare/1585699200/1585785600

https://backpack.tf/profiles/76561198125247757#!/compare/1585699200/1585785600

Untrace

sale 3:

https://backpack.tf/profiles/76561198125247757#!/compare/1588118400/1588204800

https://backpack.tf/profiles/76561198012204846#!/compare/1588118400/1588723200

Sold in bulk

sale 4:

https://backpack.tf/profiles/76561198043826027#!/compare/1586217600/1587945600

https://backpack.tf/profiles/76561198306756308#!/compare/1587772800/1587945600

Sold for 22 keys

sale 5:

https://backpack.tf/profiles/76561198976752961#!/compare/1582588800/1582675200

https://backpack.tf/profiles/76561198267189538#!/compare/1582502400/1582588800

Untrace

sale 6:

https://backpack.tf/profiles/76561198267189538#!/compare/1582588800/1582675200

https://backpack.tf/profiles/76561198044575419#!/compare/1580688000/1582675200

Sold for 17 keys

Sale 7:

https://backpack.tf/profiles/76561198305676157#!/compare/1583107200/1583193600

https://backpack.tf/profiles/76561198126434250#!/compare/1583020800/1583193600

Sold for 13 keys

sale 8:

https://backpack.tf/profiles/76561198126434250#!/compare/1583280000/1583539200

https://backpack.tf/profiles/76561198267189538#!/compare/1583452800/1583539200

Untrace/ QS

Sale 9:

https://backpack.tf/profiles/76561198267189538#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198255187641#!/compare/1583539200/1583712000

Untrace

sale 10:

https://backpack.tf/profiles/76561198255187641#!/compare/1583712000/1583798400

https://backpack.tf/profiles/76561198114402400#!/compare/1583712000/1583798400

Bulky

sale 11:

https://backpack.tf/profiles/76561198043753037#!/compare/1585008000/1585094400

https://backpack.tf/profiles/76561198057368586#!/compare/1585008000/1585094400

Keys(?)

Sale 12:

https://backpack.tf/profiles/76561198057368586#!/compare/1585353600/1585958400

https://backpack.tf/profiles/76561198342161127#!/compare/1585267200/1585353600

Bulk

Sale 13:

https://marketplace.tf/items/tf2/249;5;u17

$52 / $1.77 = 29.38 keys

$31.99 / $1.71 = 18.71 keys

$21.26 / $1.69 = 12.58 keys <--- https://backpack.tf/item/1403959157

$35.99 / $1.68 = 21.42 keys <--- https://backpack.tf/item/164870791

$39.99 / $1.69 = 23.66 keys

$40 / $1.79 = 22.35 keys

Total sales @:

13, 13, 17, 19, 21, 22, 22, 24, 29 keys

buyers up to ~18 keys,

sellers down to 24 keys,

calling 29 high,

17 low,

taking 19 - 24 keys.