Sale #1:

https://backpack.tf/profiles/76561198137420042#!/compare/1549065600/1549324800

Untraceable.

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Sale #2:

https://backpack.tf/profiles/76561198160695738#!/compare/1547164800/1547251200

Untraceable.

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Sale #3:

https://bot.tf/stats/item?def=30614&q=5&ef=Poisonous+Bubbles+of+Regret&craft=1&aus=0&ks=0

https://backpack.tf/profiles/76561198335791307#!/compare/1553472000/1553558400

Sold for 6 keys.

6 keys

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Sale #4:

https://backpack.tf/profiles/76561198363395191#!/compare/1548892800/1548979200

Untraceable.

Sales:

6. Going with 6 keys.