Fixed an error made in my previous suggestion.

https://backpack.tf/vote/Unusual/Your%20Worst%20Nightmare/Tradable/Craftable/65

Sale 1:

https://backpack.tf/profiles/76561198872941721#!/compare/1587254400/1587513600

https://backpack.tf/profiles/76561198043936328#!/compare/1587427200/1587513600

Bulk / untrace

sale 2:

https://backpack.tf/profiles/76561198009424974#!/compare/1582416000/1585094400

https://backpack.tf/profiles/76561198309261884#!/compare/1582416000/1582848000

Sold for TW Noir

used there, but another sale at 1

https://bot.tf/stats/listings/4R0P88PK

B/O of 19 keys

sale 3:

https://backpack.tf/profiles/76561198309261884#!/compare/1585180800/1585353600

https://backpack.tf/profiles/76561198972294135#!/compare/1585267200/1585353600

Untrace

sale 4:

https://backpack.tf/profiles/76561198972294135#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198150597524#!/compare/1585180800/1585353600

bulk

sale 5:

https://backpack.tf/profiles/76561198150597524#!/compare/1585353600/1585440000

https://backpack.tf/profiles/76561198168955672#!/compare/1585267200/1585440000

Sold with 2 keys for TW Comapny(15.5)

Total is 13.5 keys

https://bot.tf/stats/listings/Y5ZZ7V6E

B/O of 15 keys

sale 6:

https://backpack.tf/profiles/76561198168955672#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198037931034#!/compare/1459468800/1585440000

Untrace

sale 7:

https://backpack.tf/profiles/76561198037931034#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198311400236#!/compare/1585353600/1585440000

Sold with ~3 keys for C9 Commander

commander mini:

https://backpack.tf/suggestion/5ebdc0be1c6223322a149862

Suggestion for 15.5 keys

Total is 12.5 keys

https://bot.tf/stats/listings/Y9QQWRVD

B/O of 19 keys

sale 8:

https://backpack.tf/profiles/76561198311400236#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561198171672427#!/compare/1583280000/1585612800

https://backpack.tf/profiles/76561199011488010#!/compare/1584921600/1585612800

Untrace / bulk

sale 9:

https://marketplace.tf/items/tf2/600;5;u65

$18.07 / $1.75 = 10.33 keys

$18.07 / $1.82 = 9.93 keys

total sales @:

10, 10, 13, 14 keys