You can not trade or sell the contents of lootboxes.
In steam marketplace one can. They are going to court with New York City right now over this. [1]
[1] - https://www.youtube.com/watch?v=_waOkwIpWxg [video][18m]
alt Hacker News
In steam marketplace one can. They are going to court with New York City right now over this. [1]
[1] - https://www.youtube.com/watch?v=_waOkwIpWxg [video][18m]