Resuggestion, thanks to K1ng for the info!

Sale 1:

https://backpack.tf/profiles/76561198313773136#!/compare/1581292800/1581379200

https://backpack.tf/profiles/76561198150165501#!/compare/1584144000/1584230400

SCM

sale 2:

https://backpack.tf/profiles/76561199017599525#!/compare/1585785600/1586304000

https://backpack.tf/profiles/76561198138340148#!/compare/1585699200/1585785600

Untrace

sale 3:

https://backpack.tf/profiles/76561198138340148#!/compare/1585699200/1585785600

https://backpack.tf/profiles/76561198982803000#!/compare/1582416000/1585785600

https://backpack.tf/profiles/76561198037674114#!/compare/1585526400/1586131200

Untrace

Sale 4:

https://backpack.tf/profiles/76561198295061570#!/compare/1580515200/1580947200

https://backpack.tf/profiles/76561198414201697#!/compare/1580860800/1580947200

Sold for P Fetti Sinner

use there

https://bot.tf/stats/listings/MNLKX75R

B/O of 12 keys

Sale 5:

https://backpack.tf/profiles/76561198414201697#!/compare/1581292800/1581379200

https://backpack.tf/profiles/76561198167226845#!/compare/1581206400/1581379200

Sold for DP Bone dome + ~2 keys in sweets

Bone Mini:

https://backpack.tf/suggestion/5ead1024164c6407285526a2

Suggestion for 7.75 keys

Total is 9.75 keys

https://bot.tf/stats/listings/425Q70QZ

B/O of 9 keys, capping

Sale 6:

https://backpack.tf/profiles/76561198167226845#!/compare/1581379200/1581465600

https://backpack.tf/profiles/76561198307532189#!/compare/1581379200/1581465600

Sold with ~1 key in sweets for DBD Sober

Sober Mini:

https://backpack.tf/suggestion/5e9f67b931f3b06d3275ade5

Suggestion for 10.5 keys

Total is 9.5 keys

Sale 7:

https://backpack.tf/profiles/76561198307532189#!/compare/1581465600/1581552000

https://backpack.tf/profiles/76561198144265432#!/compare/1565136000/1581552000

Sold for TW Handle + ~0.49 keys in sweets

use there, only usable sale

sale 8:

https://marketplace.tf/items/tf2/107;5;u34

$19.99 / $1.71 = 11.69 keys

https://backpack.tf/item/782771561

Total sales @:

9, 9.5, 12 keys

K1ng's Part:

Recent marketplace sale at ~13

https://bot.tf/stats/listings/MXXV80W6 ----- B/O was also 13

Worth including it in range.