Sale #1:

https://backpack.tf/profiles/76561198164651434#!/compare/1547164800/1547424000

Sold for 11 keys.

11 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #2:

https://backpack.tf/profiles/76561198264799555#!/compare/1552521600/1552780800

Sold for 10 keys and 21.33 ref.

10 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #3:

https://backpack.tf/profiles/76561198164651434#!/compare/1546214400/1546387200

Bought for 10 keys.

10 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #4:

https://backpack.tf/profiles/76561198164651434#!/compare/1546992000/1547078400

Sold for a Steaming Berliner's Bucket Helm (11 keys).

No minis available.

11 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #5:

https://backpack.tf/profiles/76561198079364009#!/compare/1547078400/1547164800

Untraceable.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #6:

https://backpack.tf/profiles/76561198240965542#!/compare/1547078400/1547164800

Unsure, 7 keys match. Not using.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #7:

https://backpack.tf/profiles/76561198153494411#!/compare/1547164800/1547251200

Untraceable.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #8:

https://backpack.tf/profiles/76561198024723285#!/compare/1547164800/1547251200

Sold with 1 key for a Smoking Pirate Bandana (9 keys)

8 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #9:

https://backpack.tf/profiles/76561198024723285#!/compare/1547251200/1547337600

Untraceable.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #10:

https://backpack.tf/profiles/76561198219909785#!/compare/1547251200/1547424000

Sold for ~10 keys worth of items.

10 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #11:

https://backpack.tf/profiles/76561198219909785#!/compare/1547424000/1547596800

Sold for 11 keys

11 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #12:

https://bot.tf/stats/item?def=338&q=5&ef=Steaming&craft=1&aus=0&ks=0

https://backpack.tf/profiles/76561198316961222#!/compare/1547679600/1547766000

Bought for 8 keys and 18 ref.

8 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Sale #13:

https://backpack.tf/profiles/76561198305492646#!/compare/1548374400/1548633600

Sold for 12 keys.

12 keys

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Minis:

Smoking Pirate Bandana:

https://backpack.tf/profiles/76561198053787974#!/compare/1547251200/1547337600

Sold for a Strange Killstreak AWPer Hand (~9 keys)

9 keys

Sales:

8, 8, 10, 10, 10, 11, 11, 12. 10 - 11 keys seems too low based on quickbuyers, but 10 is too common not to include. Going with 10 - 12 keys.