Sale 1:

https://backpack.tf/item/6890978286

Lots of fast moves, QS's

Sale 2:

https://backpack.tf/profiles/76561198021055079#!/compare/1543017600/1543104000

https://backpack.tf/profiles/76561198004481633#!/compare/1543017600/1543104000

Sold for 11 keys

Sale 3:

https://backpack.tf/profiles/76561198004481633#!/compare/1543190400/1543276800

https://backpack.tf/profiles/76561198186922501#!/compare/1543276800/1543363200

Sold with ~7 keys for Planets Wing Mann(20)

Total is 13 keys

Sale 4:

https://backpack.tf/profiles/76561198186922501#!/compare/1543276800/1543363200

https://backpack.tf/profiles/76561198167124158#!/compare/1543276800/1543363200

Sold for N&B Cadaver + 2 keys

Nothing usable on Cadaver.

Sale 5:

https://backpack.tf/profiles/76561198167124158#!/compare/1543276800/1543363200

https://backpack.tf/profiles/76561198021055079#!/compare/1543276800/1543363200

Sold for ~9 keys

Sale 6:

https://backpack.tf/profiles/76561198165905454#!/compare/1540771200/1540857600

https://backpack.tf/profiles/76561198066195760#!/compare/1540684800/1540771200

Bulk

Sale 7:

https://backpack.tf/profiles/76561198305492646#!/compare/1547337600/1547596800

https://backpack.tf/profiles/76561198035780190#!/compare/1547510400/1547596800

https://steamuserimages-a.akamaihd.net/ugc/963108970119142583/5A6EF93E0CD27FF8703764E2AC279F231C250452/

Sold for 11 keys (thanks Jamal)

Sale 8, 9:

https://marketplace.tf/items/30007;5;u57

Sold for 22.99, 17.78 USD

Keys at 1.77, 1.64 USD

Totals are 12.98, 10.84 keys

Total sales @:

9, 10.84, 11, 11, 12.98, 13 keys

Buyers up to 9 keys,

New seller for 11 keys, watching.

https://backpack.tf/item/3912114651

Taking 11 - 13 keys