Sale 1:

https://backpack.tf/profiles/76561198070779765#!/compare/1564272000/1564444800

https://backpack.tf/profiles/76561198031013865#!/compare/1564358400/1564531200

Untrace

sale 2:

https://backpack.tf/profiles/76561198171299002#!/compare/1564876800/1568160000

https://backpack.tf/profiles/76561197997928245#!/compare/1565913600/1566086400

SCM

sale 3:

https://backpack.tf/profiles/76561197997928245#!/compare/1565913600/1566086400

https://backpack.tf/profiles/76561197999187814#!/compare/1566950400/1568073600

Untrace

Sale 4:

https://backpack.tf/profiles/76561198827903210#!/compare/1565827200/1566000000

https://backpack.tf/profiles/76561198002757046#!/compare/1565913600/1566000000

Sold for ~10 keys

sale 5:

https://backpack.tf/profiles/76561198002757046#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198059674109#!/compare/1566000000/1566086400

Sold for 14 keys

sale 6:

https://backpack.tf/profiles/76561197973696367#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198830746068#!/compare/1565913600/1566000000

QS

sale 7:

https://backpack.tf/profiles/76561198132601722#!/compare/1565308800/1566000000

https://backpack.tf/profiles/76561198277163301#!/compare/1565827200/1566000000

Sold with ~1 key in sweets for 17 keys

Total is ~16 keys

Sale 8:

https://backpack.tf/profiles/76561198277163301#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198155393755#!/compare/1566172800/1566604800

Sold for ~17 keys

Sale 9:

https://backpack.tf/profiles/76561198155393755#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198877975149#!/compare/1566518400/1566604800

Sold for Miami Wing Mann

use there

https://bot.tf/stats/listings/4W61EP9N

B/O of 19 keys

sale 10:

https://backpack.tf/profiles/76561198877975149#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198047421778#!/compare/1566604800/1566691200

Sold with 3 keys for DP Greased

use there

Sale 11:

https://backpack.tf/profiles/76561198047421778#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198125706211#!/compare/1566259200/1566691200

Sold for ~17 keys

sale 12:

https://backpack.tf/profiles/76561198007378734#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198268110229#!/compare/1565654400/1566000000

Can trace a taunt

Sale 13, 14:

https://marketplace.tf/items/tf2/390;5;u58

$50 / $1.80 = 27.78 keys

$59 / $1.82 = 32.42 keys <-- https://backpack.tf/item/7956461706

Total sales @:

10, 14, 16, 17, 17, 27.78, 32.42 keys

Buyers up to 13 keys,

seller at 18 keys,

gonna take 14 - 17 keys (both use there sales would support keeping low end if used here)