https://backpack.tf/profiles/76561198165669347#!/compare/1528848000/1529366400

https://backpack.tf/profiles/76561198056571743#!/compare/1529280000/1529366400

Added ~3 keys for PE Cyborg Stunt Helmet (24) = 21 keys

https://backpack.tf/profiles/76561198056571743#!/compare/1529280000/1529366400

https://backpack.tf/profiles/76561198017534558#!/compare/1529280000/1529366400

16 keys, qs

https://backpack.tf/profiles/76561198017534558#!/compare/1529280000/1529366400

https://backpack.tf/profiles/76561198084668327#!/compare/1529280000/1529366400

11 keys + Mega Strike Taunt: The Soviet Strongarm (6 keys: https://i.imgur.com/nL02gUT.png ) = 17 keys

https://backpack.tf/profiles/76561198120925320#!/compare/1529193600/1529798400

Screaming Tiger Taunt: The Soviet Strongarm = 15 keys

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Screaming Stromgarm mini:

https://backpack.tf/profiles/76561197999300294#!/compare/1529280000/1529366400 - 11 keys + Mega Strike Taunt: The Soviet Strongarm (6 keys: https://i.imgur.com/nL02gUT.png ) = 17 keys

https://marketplace.tf/items/30844;5;u3006

4 sales at 15 keys, one at 16

Taking unsolds: https://i.imgur.com/h0th9zs.png

I'll just take 15 flat

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Summary

Sellers: https://i.imgur.com/MU0O8Ni.png

Excluding 21 as it's countered by sellers. Taking 15-17