Sale 1:

https://backpack.tf/profiles/76561198838447026#!/compare/1581724800/1581811200

https://backpack.tf/profiles/76561198074325951#!/compare/1581552000/1581984000

Keys

sale 2:

https://backpack.tf/profiles/76561199000282388#!/compare/1584835200/1584921600

https://backpack.tf/profiles/76561198985924682#!/compare/1584748800/1584835200

QS

sale 3:

https://backpack.tf/profiles/76561198985924682#!/compare/1584921600/1585094400

https://backpack.tf/profiles/76561198062249974#!/compare/1585094400/1587168000

Untrace

sale 4:

https://backpack.tf/profiles/76561198974289370#!/compare/1582329600/1582416000

https://backpack.tf/profiles/76561198838447026#!/compare/1582329600/1582416000

Untrace

sale 5:

https://backpack.tf/profiles/76561198838447026#!/compare/1583280000/1583366400

https://backpack.tf/profiles/76561198974289370#!/compare/1583280000/1583366400

Untrace

sale 6:

https://backpack.tf/profiles/76561198087074736#!/compare/1585872000/1586131200

https://backpack.tf/profiles/76561198254861074#!/compare/1586044800/1586131200

Bulky

sale 7:

https://backpack.tf/profiles/76561198254861074#!/compare/1586217600/1586304000

https://backpack.tf/profiles/76561197995790896#!/compare/1585440000/1588118400

Sold for 8 keys

sale 8:

https://backpack.tf/profiles/76561198277016131#!/compare/1583539200/1583971200

https://backpack.tf/profiles/76561198125035818#!/compare/1583712000/1584403200

Untrace

sale 9:

https://backpack.tf/profiles/76561198125035818#!/compare/1583712000/1584403200

https://backpack.tf/profiles/76561198341171690#!/compare/1584316800/1584403200

QS

sale 10:

https://backpack.tf/profiles/76561198341171690#!/compare/1586217600/1586304000

https://backpack.tf/profiles/76561198365857261#!/compare/1586217600/1586304000

Sold for 9 keys

sale 11:

https://backpack.tf/profiles/76561198365857261#!/compare/1587600000/1587686400

https://backpack.tf/profiles/76561198239803724#!/compare/1586304000/1588118400

Utnrace

sale 12:

https://backpack.tf/profiles/76561198112281935#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561198210069337#!/compare/1585180800/1585699200

Untrace

sale 13:

https://backpack.tf/profiles/76561198210069337#!/compare/1586304000/1586563200

https://backpack.tf/profiles/76561198197292179#!/compare/1586563200/1586649600

QS(?)

Sale 14:

https://backpack.tf/profiles/76561198077721723#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198161748319#!/compare/1584489600/1585353600

Untrace

sale 15:

https://backpack.tf/profiles/76561198027901887#!/compare/1580774400/1580860800

https://backpack.tf/profiles/76561198125791160#!/compare/1580688000/1580774400

bulk

sale 16:

https://marketplace.tf/items/tf2/31080;5;u130

$22 / $1.70 = 12.94 keys <--- https://backpack.tf/item/8160669227

$15.99 / $1.68 = 9.52 keys <--- https://backpack.tf/item/8160669227

$22.95 / $1.68 = 13.66 keys

$20 / $1.79 = 11.17 keys

$14.03 / $1.81 = 7.75 keys

$14.09 / $1.79 = 7.87 keys

Total sales @:

8, 8, 8, 9, 9.5, 11, 13, 14 keys

buyers up to 6.7 keys,

months unsold for 11, 12 keys.

https://i.imgur.com/xcAD4Gn.jpg

taking 8 - 11 keys.