Sale 1:

https://backpack.tf/profiles/76561198311032797#!/compare/1580601600/1581206400

https://backpack.tf/profiles/76561198126887938#!/compare/1581206400/1581292800

Bulk

sale 2:

https://backpack.tf/profiles/76561198126887938#!/compare/1582156800/1582243200

https://backpack.tf/profiles/76561198188390563#!/compare/1581984000/1582243200

Keys?

sale 3:

https://backpack.tf/profiles/76561198188390563#!/compare/1582243200/1582588800

https://backpack.tf/profiles/76561198357505274#!/compare/1582156800/1582761600

Untrace

sale 4:

https://backpack.tf/profiles/76561198334598690#!/compare/1580688000/1580774400

https://backpack.tf/profiles/76561198334325718#!/compare/1580169600/1581811200

Sold for 11 keys

Sale 5:

https://backpack.tf/profiles/76561198141670894#!/compare/1585612800/1585699200

https://backpack.tf/profiles/76561198196410274#!/compare/1585699200/1585785600

Sold for CH highway or KaW noble, can't accurately tell.

Sale 6:

https://backpack.tf/profiles/76561198196410274#!/compare/1585699200/1585785600

https://backpack.tf/profiles/76561198244719404#!/compare/1585612800/1585785600

Sold for Searing Airdog(9.5) + 3 keys

Total is 12.5 keys

Sale 7:

https://backpack.tf/profiles/76561198244719404#!/compare/1586044800/1586131200

https://backpack.tf/profiles/76561199023895255#!/compare/1585958400/1586044800

Untrace

Sale 8:

https://backpack.tf/profiles/76561198004517334#!/compare/1582588800/1582848000

https://backpack.tf/profiles/76561198298140322#!/compare/1582416000/1582761600

Can trace some sweets

Sale 9:

https://backpack.tf/profiles/76561198298140322#!/compare/1582761600/1582934400

https://backpack.tf/profiles/76561198018101085#!/compare/1582848000/1582934400

Sold for 5D Mustacho + 2 keys

Mostacho Mini:

https://backpack.tf/suggestion/5eadac6ea8633f11d82d6412

Suggestion for 13.5 keys

Total is 15.5 keys

Sale 10:

https://marketplace.tf/items/tf2/30001;5;u58

$34 / $1.71 = 19.88 keys

Total sales @:

11, 13, 16, 20 keys

buyers up to ~10.43 keys,

sellers down to 16 keys,

https://i.imgur.com/4SvvdXE.jpg

taking 13 - 16 keys.