Team Fortress 2
Counter-Strike: Global Offensive
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Sale) Sold + Fountain of Delight Soviet Strongarm (6.5 Keys) for a Bubbling Villain's Veil (46 Keys)
46 - 6.5 = 39.5, which rounds to 40 Keys
https://marketplace.tf/items/tf2/393;5;u34 - Sold for $83.41 when Keys were ~$1.81 each
83.41 / 1.81 = 46.08, which rounds to 46 Keys
All of the other clean Veil sales were untraceable and the duped Veil sales were too low or untraceable.
https://backpack.tf/suggestion/5d2ab7b367807268ba2ed0f8 - 6.5 Keys
Veil has another recent sale at 48, but still fine to round to 40.