Sale 1:

https://backpack.tf/profiles/76561198065733542#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198816825437#!/compare/1566000000/1566086400

Sold for 18 keys

Sale 2:

https://backpack.tf/profiles/76561198816825437#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198214308952#!/compare/1566000000/1566086400

Sold for 9 keys

Sale 3:

https://backpack.tf/profiles/76561198214308952#!/compare/1566950400/1567036800

https://backpack.tf/profiles/76561198362264909#!/compare/1566864000/1567036800

Bulk

sale 4:

https://backpack.tf/profiles/76561198362264909#!/compare/1566864000/1567036800

https://backpack.tf/profiles/76561198377165880#!/compare/1566950400/1567036800

Bulk / keys / QS?

sale 5:

https://backpack.tf/profiles/76561198377165880#!/compare/1567296000/1567468800

https://backpack.tf/profiles/76561198220070825#!/compare/1567468800/1567555200

Untrace

sale 6:

https://backpack.tf/profiles/76561198119645647#!/compare/1571011200/1571184000

https://backpack.tf/profiles/76561198365721003#!/compare/1571011200/1571184000

Sold for Miami Bone Dome + ~2 keys in sweets

Dome Mini:

https://backpack.tf/suggestion/5dc90a94d381727e773627a3

Suggestion for 11 keys

Total is 13 keys

sale 7:

https://backpack.tf/profiles/76561198068234401#!/compare/1568678400/1568851200

https://backpack.tf/profiles/76561198205939253#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561198076144288#!/compare/1568764800/1568851200

https://backpack.tf/profiles/76561197984373540#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198076144288#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198089253101#!/compare/1568851200/1568937600

Gambling / Untrace

sale 8:

https://backpack.tf/profiles/76561198089253101#!/compare/1569628800/1569715200

https://backpack.tf/profiles/76561198880382914#!/compare/1569369600/1569715200

https://backpack.tf/profiles/76561198878820051#!/compare/1569456000/1569801600

https://backpack.tf/profiles/76561198973894950#!/compare/1569888000/1569974400

https://backpack.tf/profiles/76561198141405429#!/compare/1569888000/1569974400

https://backpack.tf/profiles/76561198831596900#!/compare/1569974400/1570060800

https://backpack.tf/profiles/76561197999873164#!/compare/1570060800/1570060800/nearest

gambling / bulk / untrace

Sale 9:

https://backpack.tf/profiles/76561198102670784#!/compare/1566950400/1567123200

https://backpack.tf/profiles/76561198037674114#!/compare/1566950400/1567209600

Untrace

sale 10:

https://backpack.tf/profiles/76561198037674114#!/compare/1570147200/1570665600

https://backpack.tf/profiles/76561198089253101#!/compare/1570579200/1570665600

Untrace

sale 11:

https://marketplace.tf/items/tf2/106;5;u57

$20 / $1.84 = 10.87 keys <--- https://backpack.tf/item/7955724808

$20 / $1.83 = 10.93 keys <--- https://backpack.tf/item/7956488967

Total sales @:

9, 11, 11, 13, 18 keys

buyers up to ~8.5 keys,

sellers for 13, 14 keys,

taking 11 - 13 keys.