Sale 1:

https://backpack.tf/profiles/76561198101451237#!/compare/1564531200/1565568000

https://backpack.tf/profiles/76561197964171516#!/compare/1564444800/1564531200

Bulky

Sale 2:

https://backpack.tf/profiles/76561197964171516#!/compare/1566086400/1566172800

https://backpack.tf/profiles/76561198346243193#!/compare/1566172800/1566259200

Sold for KaW Rouser

use there

Sale 3:

https://backpack.tf/profiles/76561198346243193#!/compare/1566345600/1566432000

https://backpack.tf/profiles/76561197964171516#!/compare/1566345600/1566432000

Sold with ~2 keys in sweets for Voltaic Trans(14)

Total is 12 keys

Sale 4:

https://backpack.tf/profiles/76561197964171516#!/compare/1567987200/1568073600

https://backpack.tf/profiles/76561198077969288#!/compare/1567987200/1568073600

Bulk

Sale 5:

https://backpack.tf/profiles/76561198077969288#!/compare/1568073600/1568246400

https://backpack.tf/profiles/76561198192118853#!/compare/1567555200/1568160000

Bulk

Sale 6:

https://backpack.tf/profiles/76561198305494036#!/compare/1561420800/1561507200

https://backpack.tf/profiles/76561198313538896#!/compare/1559692800/1565395200

Untrace

Sale 7:

https://backpack.tf/profiles/76561198363395191#!/compare/1561766400/1561852800

https://backpack.tf/profiles/76561198081545518#!/compare/1561075200/1561766400

Untrace

Sale 8:

https://backpack.tf/profiles/76561198278463603#!/compare/1567900800/1568160000

https://backpack.tf/profiles/76561198128297368#!/compare/1567900800/1567987200

SCM

Sale 9:

https://backpack.tf/profiles/76561198021055079#!/compare/1563062400/1563148800

https://backpack.tf/profiles/76561198358427134#!/compare/1563062400/1563148800

Sold for 15 keys

Sale 10:

https://backpack.tf/profiles/76561198002757046#!/compare/1561680000/1561766400

https://backpack.tf/profiles/76561198358778649#!/compare/1561593600/1561766400

Sold for 11 keys

Sale 11:

https://backpack.tf/profiles/76561198070593964#!/compare/1567641600/1567728000

https://backpack.tf/profiles/76561198080179568#!/compare/1567641600/1567728000

QS

Sale 12:

https://marketplace.tf/items/tf2/30911;5;u8

$30.99 / $1.83 = 16.93 keys

https://backpack.tf/item/7236955715

https://bot.tf/stats/listings/4R9O0K9M

B/o of 15 keys, capping

Total sales @:

11, 12, 15, 15 keys

unsold for ~2 weeks for 12 keys,

https://i.imgur.com/7WP98Kv.png

Taking 11 - 15 keys, doesn't seem right to call 2 sales at 15, one pure, high.