Sale #1:

https://backpack.tf/profiles/76561198040912048#!/compare/1548115200/1549238400

Untraceable.

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Sale #2:

https://marketplace.tf/items/30616;5;u3022

Sold for $29.69.

$29.69 / $1.80 = ~16 keys

16 keys

Sales:

16. Seller at 15 keys determines low-end (https://i.imgur.com/fXdAM7b.png).