Sale 1:

https://backpack.tf/profiles/76561198197292179#!/compare/1564790400/1564876800

https://backpack.tf/profiles/76561198097962791#!/compare/1555027200/1564876800

Untrace

sale 2:

https://backpack.tf/profiles/76561198177569915#!/compare/1568332800/1568419200

https://backpack.tf/profiles/76561198251704884#!/compare/1568332800/1568419200

Untrace

sale 3:

https://backpack.tf/profiles/76561198078303623#!/compare/1563926400/1564012800

https://backpack.tf/profiles/76561198002757046#!/compare/1563926400/1564012800

QS

Sale 4:

https://backpack.tf/profiles/76561198002757046#!/compare/1564444800/1564531200

https://backpack.tf/profiles/76561198223331996#!/compare/1564444800/1564531200

Sold for keys, at least 63, but probably more...

Sale 5:

https://backpack.tf/profiles/76561198223331996#!/compare/1564876800/1564963200

https://backpack.tf/profiles/76561198044547547#!/compare/1564876800/1564963200

Untrace

sale 6:

https://backpack.tf/profiles/76561198044547547#!/compare/1564963200/1565049600

https://backpack.tf/profiles/76561198170098378#!/compare/1564963200/1565049600

Sold for 50 keys + DBD Pillar(34.5)

Total is 84.5 keys

Sale 7:

https://backpack.tf/profiles/76561198170098378#!/compare/1565740800/1565913600

https://backpack.tf/profiles/76561198059703923#!/compare/1565827200/1565913600

Sold for Eldritch Pullover + 5 keys

used there

Sale 8:

https://backpack.tf/profiles/76561198059703923#!/compare/1570924800/1571011200

https://backpack.tf/profiles/76561198034268412#!/compare/1570924800/1571011200

Sold for Scorching Capuchon + C9 Polar(13.5) + Insomnia Nickel

Nickel Mini:

https://backpack.tf/suggestion/5dad70a2d38172182537dd35

Suggestion for 16 keys

Capuchon Mini:

https://backpack.tf/suggestion/5dad77a4678072304a626d01

Suggestion for 42.5 keys

Total is 72 keys

Sale 9:

https://marketplace.tf/items/tf2/30542;5;u9

$133 / $1.84 = 72.28 keys

total sales @:

72, 72, 84.5 keys

single buyer at 76 keys, high considering more buyers at ~58 keys.

taking 72 - 85 keys