Thanks to erik + K1ng + Mindacos for pointing out these sales

https://backpack.tf/profiles/76561198050958150#!/compare/1522713600/1522800000

Sold for 8 keys.

https://backpack.tf/profiles/76561198013011182#!/compare/1519516800/1519603200

Probably better used on Geisha.

https://backpack.tf/profiles/76561198038040956#!/compare/1519689600/1519776000

Sold for 8.1 keys

https://backpack.tf/profiles/76561198052281364#!/compare/1520812800/1520985600

Bulk (qs)

https://marketplace.tf/items/314;5;u12

Sold for $16 ( / $1,99 ) = 8 keys.

https://marketplace.tf/items/314;5;u12

Sold for $23.77 ( / $1,98 ) = 12 keys (seems really high, looking at current sellers).

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Recent sale at ~10 keys on marketplace. Also another sale at 9 keys confirmed on bot.tf:

https://backpack.tf/profiles/76561198305492646#!/compare/1520812800/1520899200

https://imgur.com/a/yBmbGml

Alot of buyers at 8, going with 9 - 10

9 - 10