Sale 1:

https://backpack.tf/profiles/76561198834678807#!/compare/1581292800/1583280000

https://backpack.tf/profiles/76561198384153549#!/compare/1581984000/1582761600

Bulk / untrace

sale 2:

https://backpack.tf/profiles/76561198384153549#!/compare/1582761600/1583107200

https://backpack.tf/profiles/76561198384153549#!/compare/1582761600/1583107200

Untrace

sale 3:

https://backpack.tf/profiles/76561198964398715#!/compare/1581120000/1581465600

https://backpack.tf/profiles/76561198337734785#!/compare/1581379200/1581465600

QS

Sale 4:

https://backpack.tf/profiles/76561198337734785#!/compare/1581638400/1581724800

https://backpack.tf/profiles/76561198106006194#!/compare/1580860800/1581724800

Keys

Sale 5:

https://backpack.tf/profiles/76561198128077282#!/compare/1580601600/1580947200

https://backpack.tf/profiles/76561198827124516#!/compare/1580860800/1580947200

SCM

sale 6:

https://backpack.tf/profiles/76561198827124516#!/compare/1582070400/1582243200

https://backpack.tf/profiles/76561198850895547#!/compare/1581811200/1582243200

Sold for 11 keys

sale 7:

https://backpack.tf/profiles/76561198850895547#!/compare/1582588800/1582675200

https://backpack.tf/profiles/76561198087978463#!/compare/1582502400/1582675200

Sold for Slumber Elfin + negligible sweets

use there

Sale 8:

https://backpack.tf/profiles/76561198087978463#!/compare/1582761600/1583020800

https://backpack.tf/profiles/76561199009181915#!/compare/1584316800/1584576000

Untrace

sale 9:

https://backpack.tf/profiles/76561199009181915#!/compare/1584748800/1584835200

https://backpack.tf/profiles/76561198021055079#!/compare/1584748800/1584835200

Bulky

sale 10:

https://backpack.tf/profiles/76561198059248968#!/compare/1583971200/1584057600

https://backpack.tf/profiles/76561198257210962#!/compare/1583971200/1584057600

Sold with 1 key for KaW YWN

use there

sale 11:

https://backpack.tf/profiles/76561198257210962#!/compare/1584316800/1584489600

https://backpack.tf/profiles/76561198002757046#!/compare/1584316800/1584489600

QS

sale 12:

https://backpack.tf/profiles/76561198002757046#!/compare/1584748800/1584835200

https://backpack.tf/profiles/76561198339104273#!/compare/1584576000/1584835200

Sold for 11 keys

Sale 13:

https://marketplace.tf/items/tf2/30093;5;u62

$25 / $1.75 = 14.29 keys

$25 / $1.73 = 14.45 keys <--- https://backpack.tf/item/1965169129

$18.99 / $1.77 = 10.73 keys

Total sales @:

11, 11, 11, 14, 14 keys

buyers up to ~9.5 keys,

sellers down to 15 keys,

Taking 11 - 14 keys