Sad to say fact but im 100% sure he wont get back the eggs by help from support the best support can do if you have evidence is to ban him wich the best way is email support.
And as for your friend let this be a lesson for him as you say he trusted a "stranger" people get scammed by their close friends for less amount he literally trade 6m of value to an unknown person hopefully he learn from his misstake now and never give anyone anything.
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