Team Fortress 2
Counter-Strike: Global Offensive
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Sold for KaW Hong Kong Cone + 40 keys
KaW Hong Kong is in-date at 50 keys, but has sellers under 50 keys
Buy orders are also really close to the sell orders...
45 keys + 4 refined
Choosing 45 for the Cone, making Sale 1 worth 85 keys.
Sold with Searing Pyromancer's Mask for Duped Green Energy Pyromancer's Mask
February 5, 2019 sold for $179.99 / 1.82 = 99 keys
Can't find any other sales on the Searing Pyromancer's that I looked through.
Duped GE Pyromancer's
I don't know
Sold for Purple Energy Pyromancer's, which is in-date at 165
x + 99 = 165, this makes the Falkirk Helm worth 66 keys.
However, this sale was determined to be unusable because it would be considered a bulk sale for the Searing Pyromancer's and the Falkirk Helm.
Please refer to the comments in this suggestion for a more detailed explanation.
Thank you to Torb for helping me with this suggestion.
Going with 85 keys flat based off of sale 1.