Sale 1:

https://backpack.tf/profiles/76561198081793950#!/compare/1529366400/1529452800

https://backpack.tf/profiles/76561198200909977#!/compare/1529280000/1529366400

Sold for 14 keys

Sale 2:

https://backpack.tf/profiles/76561198200909977#!/compare/1531526400/1531612800

https://backpack.tf/profiles/76561198796668537#!/compare/1531526400/1531612800

Sold for ST Most Wanted(6.25) + Midnight Yeti Smash(5.5) + 2 keys + ~2 keys in sweets

Total is ~16 keys

Sale 3:

https://backpack.tf/profiles/76561198796668537#!/compare/1532044800/1532304000

Untrace.

Sale 4:

https://backpack.tf/profiles/76561198204215085#!/compare/1532736000/1532822400

bulk

Sale 5:

https://backpack.tf/profiles/76561198204215085#!/compare/1532822400/1532908800

https://backpack.tf/profiles/76561198154864046#!/compare/1532822400/1532908800

Sold for Aces Samur-Eye + 1 key

Eye Mini:

https://backpack.tf/suggestion/5b6c1659cf6c750e0e248139

Suggestion for 14.5 keys

Total is 15.5 keys

Sale 6:

https://backpack.tf/profiles/76561198204215085#!/compare/1533254400/1533340800

https://backpack.tf/profiles/76561198146727359#!/compare/1533254400/1533340800

Bulky...

Sale 7:

https://backpack.tf/profiles/76561198074924284#!/compare/1533859200/1533945600

Looks like it sold with ~3 keys in sweets for Vivid Buckaroo Hat (Can't tell cause private inventory)

Not using, can't mini Buckaroo anyway.

Sale 8:

https://marketplace.tf/items/30109;5;u6

Sold for 30.5 USD

Keys at 1.94 USD

Total is 15.72 keys

Total sales @:

14, 15.5, 15.72, 16 keys

https://i.imgur.com/GgseXJh.png

Sellers at 16 & 18

https://backpack.tf/item/2535606159

https://backpack.tf/item/5601825720

Buyers up to 10 keys

Taking 14 - 16 keys