More sales. Credits to Erik.

https://backpack.tf/item/5990857363

Sale 1) Sold for 10 Keys + ~1 Key of Items

https://backpack.tf/profiles/76561198206563156#!/compare/1520726400/1520812800 - Buyer's Backpack

10 + 1 = 11 Keys

Sale 2) Sold for a Steaming Brain Bucket (9.5 Keys) + ~2 Keys of Items

https://backpack.tf/profiles/76561198188401374#!/compare/1520121600/1520467200

9.5 + 2 = 11.5 Keys

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Erik's Sales

https://backpack.tf/profiles/76561198304138933#!/compare/1520294400/1520380800

https://backpack.tf/profiles/76561198316091835#!/compare/1513728000/1520380800

https://gyazo.com/37c8e2a51db2f29d50ec4b7c3d199273

Sold for 9 keys + 13 ref = 9.5 Keys. Took 5 days.

https://backpack.tf/profiles/76561198304138933#!/compare/1520812800/1520899200

https://backpack.tf/profiles/76561198116110446#!/compare/1520812800/1520899200

https://gyazo.com/37c8e2a51db2f29d50ec4b7c3d199273

Sold for 9 keys + 13 ref = 9.5 Keys. Took 1 day.

https://backpack.tf/profiles/76561198304138933#!/compare/1522886400/1522972800

https://backpack.tf/profiles/76561198035278233#!/compare/1522713600/1523318400

https://gyazo.com/37c8e2a51db2f29d50ec4b7c3d199273

Sold for 9 keys + 17 ref = roughly 9.6 keys. Rounds to 9.5 Keys. Took 4 days.